Electricity
Nolan is making a capacitor using plates that have an areaof 3.2 × 10-4 m2 separated by a distance of 0.20 mm. He has the two dielectrics listed in the table. At a voltage of 1.5 V, how much more charge can Nolan store in the capacitor using dielectric 1 than he could store using dielectric 2? 7.5 × 10-11 C 9.6 × 10-11 C 1.1 × 10-10 C 1.4 × 10-10 C
1.1 × 10-10 C
A circuit is built based on the circuit diagram shown. What is the current in the 50 Ω resistor? 1.2 A 1.5 A 2.0 A 4.6 A
1.2 A
A series circuit contains a 30 Ω resistor, a 20 Ω resistor, and a 10 Ω resistor. The power supply provides 100 V to the circuit. The current in the 10 Ω resistor, to two significant figures, is ___ A.
1.7
The electric field between two parallel plates has a magnitude of 875 N/C. The positive plate is 0.002 m away from the negative plate. What is the electric potential difference between the plates? 2.3 × 10-6 V 1.8 × 100 V 8.8 × 102 V 4.4 × 104 V
1.8 × 100 V
A charge of 24 µC is at a location where the electric potential is 8.0 V. What is the electric potential energy of the charge? 3.0 × 10-6 J 1.9 × 10-4 J 3.0 × 100 J 1.9 × 102 J
1.9 × 10-4 J
The current in the circuit shown is 2.0 A. What is the value of R3? 10 Ω 15 Ω 20 Ω 55 Ω
10 Ω
A 7.2 × 10-5 C charge has an electric potential energy of 1.08 × 10-2 J. The electric potential, to the nearest whole number, is ___ V.
150
A circuit has a current of 3.6 A and a resistance of 5.0 Ω. What is the voltage applied to the circuit? 0.72 V 1.4 V 8.6 V 18 V
18 V
A ceiling fan draws a current of 0.625 A and has a voltage of 120 V. The resistance of the ceiling fan, to the nearest whole number, is ___ Ω.
192
Current 1 of 8.4 A runs for 240 seconds and then stops. Current 2 is 10.5 A. How long does current 2 have to run to deliver the same amount of charge as current 1? 88.2 s 192 s 2016 s 21,000 s
192 s
A power source of 6.0 V is attached to the ends of a capacitor. The charge is 12 C. What is the capacitance for this capacitor? 0.50 μF 2.0 μF 6.0 μF 72 μF
2.0 μF
A source charge generates an electric field of 1236 N/C at a distance of 4 m. What is the magnitude of the source charge? 2.2 µC 680 µC 2.2 C 680 C
2.2 µC
A capacitor stores 7.6 × 10-11 C when the electric potential difference between the plates is 5.8 V. What is the electric potential energy stored in the capacitor? 6.6 × 10-12 J 4.4 × 10-10 J 2.2 × 10-10 J 1.3 × 10-9 J
2.2 × 10-10 J
The plates on a vacuum capacitor have a radius of 2.5 mm and are separated by a distance of 0.75 mm. What is the capacitance of this capacitor? 2.3 × 10-13 F 9.3 × 10-11 F 3.0 × 10-11 F 2.3 × 10-10 F
2.3 × 10-13 F
A proton is moved from a position where the electric potential is 125 V to a position where the electric potential is 275 V. The magnitude of the charge on a proton is 1.602 × 10-19 C. What is the change in electric potential energy of the proton? 2.0 × 10-17 J 2.4 × 10-17 J 4.4 × 10-17 J 6.4 × 10-17 J
2.4 × 10-17 J
A charge of 8.5 × 10-6 C is in an electric field that has a strength of 3.2 × 105 N/C. What is the electric force acting on the charge? 0.27 N 2.7 N 27 N 270 N
2.7 N
What is the strength of the electric field 0.020 m from a 12 µC charge? 5.4 × 106 N/C 2.7 × 108 N/C 5.4 × 1012 N/C 2.7 × 1014 N/C
2.7 × 108 N/C
A charge of 6.4 × 10-7 C experiences an electric force of 1.8 × 10-1 N. What is the electric field strength? 1.1 × 10-7 N/C 3.6 × 10-6 N/C 8.2 × 100 N/C 2.8 × 105 N/C
2.8 × 105 N/C
The strength of the electric field 0.5 m from a 6 µC charge is _______ N/C. (Use k = 8.99 × 109 N• and round answer to the nearest whole number.) 215760 539400 697976 512356
215760
A power source that provides a current of 1.6 A to two 5 Ω resistors connected in series is moved to a parallel circuit that consists of three identical resistors. In the parallel circuit, the overall current is 2.0 A. The value of a resistor used in the parallel circuit is __ Ω.
24
A proton is moved so that its electric potential energy increases from 2.0 × 10-18 J to 6.0 × 10-18 J. The magnitude of the charge on a proton is 1.602 × 10-19 C. The electric potential difference through which the proton moved, to the nearest whole number, is __ V.
25
A wire delivers 12.0 C of charge in 4.0 s. What is the current in the wire? 3.0 A 8.0 A 16 A 48 A
3.0 A
A source charge generates an electric field of 4286 N/C at a distance of 2.5 m. What is the magnitude of the source charge? 1.2 µC 3.0 µC 1.2 C 3.0 C
3.0 µC
What is the electric potential energy of a charge that experiences a force of 3.6 × 10-4 N when it is 9.8 × 10-5 m from the source of the electric field? 3.5 × 10-8 J 4.6 × 10-4 J 2.7 × 10-1 J 3.7 × 100 J
3.5 × 10-8 J
What is the value of the charge that experiences a force of 2.4 × 10-3 N in an electric field of 6.8 × 10-5 N/C? 1.6 × 10-7 C 2.5 × 10-3 C 2.8 × 10-3 C 3.5 × 101 C
3.5 × 101 C
What is the electric field between two parallel plates if the electric potential difference between the plates is 24 V and the plates are 65 mm apart? 0.0027 N/C 1.6 N/C 369 N/C 1560 N/C
369 N/C
A circuit has a resistance of 2.5 Ω and is powered by a 12.0 V battery. The current in the circuit, to the nearest tenth, is ___ A.
4.8
The electric potential difference of a 125 F capacitor is measured across the terminals of the capacitor and found to be 9.0 V. The potential energy of the capacitor, rounded to two significant figures, is ___ mJ.
5.1
The plates on a capacitor have a radius of 1.5 mm and are separated by a distance of 0.43 mm. The space between the plates is filled with a dielectric that has a dielectric constant of 3.8. What is the capacitance of this capacitor? 5.5 × 10-13 F 1.4 × 10-13 F 5.5 × 10-10 F 1.4 × 10-10 F
5.5 × 10-13 F
What is the electric potential at a distance of 1.2 m from a 7.5 µC point charge? 5.6 × 104 V 8.1 × 104 V 5.6 × 1010 V 8.1 × 1010 V
5.6 × 104 V
A charge of +0.08 C moves to the right due to a 4 N force exerted by an electric field. What is the magnitude and direction of the electric field? 0.32 N/C left 0.32 N/C right 50 N/C left 50 N/C right
50 N/C right
A point charge of 8.0 C is placed 0.050 m from a rod that has an electric field of 1.5 × 103 N/C. What is the electric potential energy of the point charge? 6.0 × 10-4 J 2.4 × 10-1 J 6.0 × 102 J 2.4 × 105 J
6.0 × 10-4 J
The magnitude of the electrical force acting between a +2.4 × 10-8 C charge and a +1.8 × 10-6 C charge that are separated by 0.008 m is ___ N, rounded to the tenths place.
6.1
The electric field between two parallel plates has a magnitude of 1250 N/C. The positive plate is 0.05 m away from the negative plate. The electric potential difference between the plates, rounded to the tenths place, is ____ V.
62.5
A point charge of 6.0 C is placed 5.0 mm from a rod that has an electric field of 2.4 N/C. The electric potential energy of the point charge (rounded to two significant figures) is __ J.
72
In 12 s, a wire delivers 96 C of charge. The current in the wire, to the nearest whole number, is _ A.
8
A capacitor stores 6.2 × 10-8 C of charge and 2.4 × 10-6 J of energy. What is the capacitance of the capacitor? 8.0 × 10-10 F 1.6 × 10-9 F 4.6 × 10-5 F 9.3 × 10-5 F
8.0 × 10-10 F
A current of 6.0 A runs through a circuit for 2.5 minutes. How much charge was delivered to this circuit? 15 C 25 C 600 C 900 C
900 C
Which equation relates charge, time, and current? A B C D
A
Which equations can be used to calculate the electric potential energy stored in a capacitor? Check all that apply. A B C D E F
A D E
Which are disadvantages of series circuits? Check all that apply. They are easy to design and build. They are complicated to design and build. A break in one wire causes all current to stop. Current can flow through other branches if there is a break in one branch. If one bulb goes out, the others stay lit. If one bulb goes out, the others go out.
A break in one wire causes all current to stop. If one bulb goes out, the others go out.
Which statement correctly describes the formation of an electric current? A resistance causes electric charges to move from lower to higher potential. A voltage causes electric charges to move from lower to higher potential. A resistance causes electric charges to move from higher to lower potential. A voltage causes electric charges to move from higher to lower potential.
A voltage causes electric charges to move from higher to lower potential.
Which equations should be used only in a uniform electric field? Check all that apply. A B C D E
AD
Humberto builds two circuits using identical components. Circuit 1: A series circuit with three lightbulbsCircuit 2: A parallel circuit with three lightbulbs He then adds two more lightbulbs in a series with the bulbs in circuit 1 and two more lightbulbs on new branches in parallel with each bulb in circuit 2. What can he expect to see? All bulbs in circuit 1 will shine at the same brightness as the original bulbs, while all bulbs in circuit 2 will be dimmer than the original bulbs. All bulbs in circuit 1 will shine more dimly than the original bulbs, while all bulbs in circuit 2 will have the same brightness as the original bulbs. The original bulbs will remain at their original brightness, but the bulbs added to circuit 1 will be dimmer than the bulbs added to circuit 2. The original bulbs will remain at their original brightness, but the bulbs added to circuit 1 will be brighter than the bulbs added to circuit 2.
All bulbs in circuit 1 will shine more dimly than the original bulbs, while all bulbs in circuit 2 will have the same brightness as the original bulbs.
Wendy makes a graphic organizer to help herself apply Ohm's law to electric circuits. Which formulas belong in the regions marked X and Y? A B C D
B
Which equation is used to calculate the electric potential in an electric field from a point charge? A B C D
B
What formula gives the strength of an electric field, E, at a distance from a known source charge? A B C D
C
What is the equation for calculating the electrical force, Fe, between two charges? A B C D
C
The diagram shows the electric field due to point charge Q. The negative charge, A, is within the field. Which statements are correct? Check all that apply. Charge Q is positive. Charge Q is negative. The electric field is uniform. The electric field is nonuniform. If charge A is negative, it moves away from charge Q. If charge A is positive, it moves away from charge Q.
Charge Q is negative. The electric field is nonuniform. If charge A is negative, it moves away from charge Q.
Which statements best characterize conductors? Check all that apply. Conductors allow electricity to easily move through them. Glass is an example of a conductor. Metal is an example of a conductor. Conductors do not allow electricity to easily move through them. Conductors restrict the flow of thermal energy.
Conductors allow electricity to easily move through them. Metal is an example of a conductor.
How are electric potential difference and electric potential energy related? Electric potential difference is the charge divided by the difference in electric potential energy. Electric potential energy is the charge divided by the electric potential difference. Electric potential difference is the difference in electric potential energy divided by the charge. Electric potential energy is the electric potential difference divided by the charge.
Electric potential difference is the difference in electric potential energy divided by the charge.
A capacitor is connected to a power source and begins charging. What causes the capacitor to stop charging while it is still connected to the power source? The power source runs out of electrons to send to the charged plate. No additional positive charges can be moved onto the second plate. The charged plates attract each other and touch, causing a discharge. Electrons are too strongly repelled from the negatively charged plate.
Electrons are too strongly repelled from the negatively charged plate.
How does the electrical force relate to the charge of an object? It is inversely proportional to the square of the charge. It is directly proportional to the square of the charge. It is inversely proportional to the charge. It is directly proportional to the charge.
It is directly proportional to the charge.
How does the electrical force relate to the distance between two charged objects? It is inversely proportional to the square of the distance. It is directly proportional to the square of the distance. It is inversely proportional to the distance. It is directly proportional to the distance.
It is inversely proportional to the square of the distance.
How is capacitance related to the distance between the plates of a capacitor? It is directly proportional, so the capacitance increases as the distance increases. It is inversely proportional, so the capacitance increases as the distance increases. It is directly proportional, so the capacitance decreases as the distance increases. It is inversely proportional, so the capacitance decreases as the distance increases.
It is inversely proportional, so the capacitance decreases as the distance increases.
How does a rubber rod become negatively charged through friction? It touches a negatively charged object, and protons move off of the rod. It touches a positively charged object, and electrons move onto the rod. It is rubbed with another object, and electrons move onto the rod. It is rubbed with another object, and protons move off of the rod.
It is rubbed with another object, and electrons move onto the rod.
Marta, Cato, and Juan plan a skit to illustrate one of the methods of charging. Marta and Cato are walking together. Each has one flower and one box of candy. Juan offers Cato a huge bouquet of flowers, but Cato can't take it because his hands are full. Cato hands his flower to Marta and then turns to Juan to take the bouquet. Marta walks away in one direction with two flowers and one box of candy. Juan keeps the bouquet and walks away in the other direction. Cato looks sad standing alone with only a box of candy. How does the skit model a method of charging? It models induction because an electron (a flower) transfers from Cato to Marta through direct contact. It models friction because an electron (a flower) transfers from Cato to Marta through direct contact. It models friction because the offer of flowers represents a charged object that causes an electron (a flower) to transfer from one object to another. It models induction because the offer of flowers represents a charged object that causes an electron (a flower) to transfer from one object to another.
It models induction because the offer of flowers represents a charged object that causes an electron (a flower) to transfer from one object to another.
Rami uses a disposable camera that has a flash. When he wants to take a picture, he holds a button and hears a rising whining sound. When a small light glows, the flash is ready. He presses the shutter button, the flash lights up, and he takes his picture. Which statement best describes how a capacitor is useful in the camera? It protects the circuits from a burst of energy by storing charge. It protects the circuits from a steady current by storing charge. It stores energy and delivers it in a short burst. It stores energy and delivers it in a steady current.
It stores energy and delivers it in a short burst.
One charge is decreased to one-third of its original value, and a second charge is decreased to one-half of its original value. How will the electrical force between the charges compare with the original force? It will increase to six times the original force. It will increase to thirty-six times the original force. It will decrease to one-sixth the original force. It will decrease to one-thirty-sixth the original force.
It will decrease to one-sixth the original force.
Cici uses a long extension cord to plug a lamp into a wall outlet in the next room. What effect will the extension cord have on the circuit? It will decrease the resistance of the circuit. It will increase the voltage of the outlet. It will increase the resistance in the circuit. It will decrease the voltage of the outlet.
It will increase the resistance in the circuit.
A negative charge is placed between a pair of oppositely charged plates, as shown. Which best describes the result of moving the charge to the point marked X? Its electric potential energy increases because it has the same electric field. Its electric potential energy increases because the electric field increases. Its electric potential energy stays the same because the electric field increases. Its electric potential energy stays the same because it has the same electric potential.
Its electric potential energy stays the same because it has the same electric potential.
Which best describes the electric field created by a positive charge? It circles clockwise around the charge. It circles counterclockwise around the charge. Its rays point away from the charge. Its rays point toward the charge.
Its rays point away from the charge.
Jason makes a graphic organizer for insulators and conductors and wants to add the following labels to it. Label 1: Lacks free electrons Label 2: Aluminum In which regions should Jason place each label? Label 1: X Label 2: Y Label 1: Z Label 2: X Label 1: X Label 2: Z Label 1: Z Label 2: Z
Label 1: X Label 2: Z
Maria makes a graphic organizer to compare open, closed, and short circuits. She adds the labels shown. Label 1: Current flows in the circuit.Label 2: This forms when a bulb burns out. In which region should she place each label? Label 1: Z Label 2: X Label 1: Y Label 2: W Label 1: X Label 2: Y Label 1: Y Label 2: Z
Label 1: Y Label 2: W
A circuit carries a current of 0.64 A when there is a resistance of 50.0 Ω. The voltage applied to the circuit, to the nearest whole number, is _ V.
NOT 33
Nolan is making a capacitor using plates that have an areaof 3.2 × 10-4 m2 separated by a distance of 0.20 mm. He has the two dielectrics listed in the table. At a voltage of 1.5 V, how much more charge can Nolan store in the capacitor using dielectric 1 than he could store using dielectric 2? 7.5 × 10-11 C 9.6 × 10-11 C 1.1 × 10-10 C 1.4 × 10-10 C
NOT 9.6 × 10-11 C
How does charging by conduction occur? A charged object is brought near a neutral object without touching it. A neutral object touches another neutral object. A charged object touches a neutral object. A neutral object is brought near another neutral object without touching it.
NOT A neutral object touches another neutral object.
One charge is decreased to one-third of its original value, and a second charge is decreased to one-half of its original value. How will the electrical force between the charges compare with the original force? It will increase to six times the original force. It will increase to thirty-six times the original force. It will decrease to one-sixth the original force. It will decrease to one-thirty-sixth the original force
NOT It will increase to thirty-six times the original force.
For a constant voltage, how is the resistance related to the current? Resistance is inversely proportional to current, so when the resistance doubles, the current is cut in half. Resistance is directly proportional to current, so when the resistance doubles, the current is cut in half. Resistance is inversely proportional to current, so when the resistance doubles, the current doubles. Resistance is directly proportional to current, so when the resistance doubles, the current doubles.
Resistance is inversely proportional to current, so when the resistance doubles, the current is cut in half.
In a movie, the heroine saves the day by cutting a wire before the time runs out on a timer. How did she change the circuit? She changed a short circuit to an open circuit. She changed an open circuit to a closed circuit. She changed a closed circuit to an open circuit. She changed a closed circuit to a short circuit.
She changed a closed circuit to an open circuit.
A positive rod is placed to the left of sphere A, and the spheres are separated. Which best describes the spheres? Sphere A is negative and sphere B is positive because protons from sphere A are attracted to the rod and move to sphere B. Sphere A is negative and sphere B is positive because electrons from sphere B are attracted to the rod and move to sphere A. Sphere A is positive and sphere B is negative because electrons from the rod move to sphere B and protons then move to sphere A. Sphere A is positive and sphere B is negative because protons move from sphere B to the rod and also to sphere A.
Sphere A is negative and sphere B is positive because electrons from sphere B are attracted to the rod and move to sphere A.
What is the result of changing the dielectric in a capacitor to a dielectric with a larger dielectric constant? The capacitor will have a lower charge at a given potential energy. The capacitor will have a higher potential difference at a given potential energy. The capacitor can store less potential energy at a given potential difference. The capacitor can store more charge at a given potential difference.
The capacitor can store more charge at a given potential difference.
Jason sees a news report about a traffic jam caused by a truckload of tires that spilled across the road. The next day in class, he uses the traffic jam as an analogy to explain electric circuits to his friend. Which is most likely the analogy that Jason used? The cars represent moving charges, and the spilled tires represent an increased voltage that causes the current to decrease. The cars represent moving charges, and the spilled tires represent an increased resistance that causes the current to decrease. The tires represent moving charges, and the cars represent an increased resistance that causes the current to decrease. The tires represent moving charges, and the cars represent an increased voltage that causes the current to decrease.
The cars represent moving charges, and the spilled tires represent an increased resistance that causes the current to decrease.
A negative test charge experiences a force to the right as a result of an electric field. Which is the best conclusion to draw based on this description? The electric field points to the left because the force on a negative charge is opposite to the direction of the field. The electric field points to the right because the force on a negative charge is in the same direction as the field. No conclusion can be drawn because the sign of the charge creating the field is unknown. No conclusion can be drawn because the amount of charge on the test charge is unknown.
The electric field points to the left because the force on a negative charge is opposite to the direction of the field.
The table lists the values of the electrical force and the gravitational force between two protons. How do the electrical force and the gravitational force compare? The electrical force is 1.2 × 1036 times less than the gravitational force. The electrical force is 1.2 × 1036 times greater than the gravitational force. The electrical force is 8.0 × 10-37 times less than the gravitational force. The electrical force is 8.0 × 10-37 times greater than the gravitational force.
The electrical force is 1.2 × 1036 times greater than the gravitational force.
Which statements correctly compare the gravitational force with the electrical force? Check all that apply. The gravitational force can be repulsive. The gravitational force can be attractive. The electrical force can be repulsive. The electrical force can be attractive. Any two objects experience a gravitational force between them. Any two objects experience an electrical force between them.
The gravitational force can be attractive. The electrical force can be repulsive. The electrical force can be attractive. Any two objects experience a gravitational force between them.
The table lists the mass and charge of a proton and a neutron. How do the gravitational and electrical forces between a proton and a neutron compare? The gravitational force is much smaller than the electrical force for any distance between the particles. The gravitational force is much larger than the electrical force for any distance between the particles. The gravitational force is much smaller than the electrical force for only very small distances between the particles. The gravitational force is much larger than the electrical force for only very small distances between the particles.
The gravitational force is much larger than the electrical force for any distance between the particles.
Rolanda sees an error in her friend's graphic organizer comparing electrical and gravitational forces. Which change should Rolanda suggest to her friend to correct the error? The note about mass belongs in region Z, and the note about charge belongs in region X. The note about mass belongs in region Y, and the note about infinite reach belongs in region Z. The note about charge belongs in region Y. The note about infinite reach belongs in region Y.
The note about infinite reach belongs in region Y.
How do the charges compare when two objects are charged through friction? The objects become oppositely charged and have equal amounts of charge. The objects become positively charged and have equal amounts of charge. The objects become negatively charged and have different amounts of charge. The objects become oppositely charged and have different amounts of charge.
The objects become oppositely charged and have equal amounts of charge.
The cause of a fire in a computer is described as an incorrectly wired circuit. Which statement best explains the likely cause of the fire? The wiring contained a short circuit, so the reduced resistance caused an increase in current. The wiring contained an open circuit, so the reduced resistance caused an increase in current. The wiring contained a closed circuit, so the current was redirected around the components that would have provided the proper resistance. The wiring contained an open circuit, so the current was redirected around the components that would have provided the proper resistance.
The wiring contained a short circuit, so the reduced resistance caused an increase in current.
Both the electrical force and the gravitational force between two objects share which relationship? They are directly proportional to mass. They are inversely proportional to the square of the distance. They are inversely proportional to charge. They are directly proportional to the square of the distance.
They are inversely proportional to the square of the distance.
Which statements about electric field lines are correct? Check all that apply. They point toward a positive charge. They point toward a negative charge. They point away from a positive charge. They point away from a negative charge. They cross over one another between charges. They never cross.
They point toward a negative charge. They point away from a positive charge. They never cross.
What is the abbreviation for the SI unit for electric potential? V J C U
V
Charges of +2 µC and +3 µC are 4 mm from each other. Raina's group draws four diagrams trying to represent the electrical force between the charges. Which diagram is correct? W X Y Z
W
Keisha analyzes this circuit diagram. Which circuit component should Keisha use to start or stop the current in the circuit? W X Y Z
W
The diagram shows four locations in the electric field of a positive point charge. At which point is the electric potential the greatest? W X Y Z
W
Three charges are located at the vertices of a triangle, as shown. Which vector best represents the net force acting on the -3 C charge in the diagram? W X Y Z
W
Three charges are located at the vertices of a triangle, as shown. Which vector best represents the net force acting on the +4 C charge in the diagram? W X Y Z
X
Bruce collects the data on four electric circuits listed in the table. Bruce must report any circuits that deliver more than 4.0 C of charge in 8.0 s. Which lists every circuit that Bruce must include in his report? X and Z X and Y W and Y W and Z
X and Z
Kiki makes a table to compare the particles in a magnesium atom to those in a magnesium ion. She knows that a magnesium ion has an electric field that points away from the ion. What values should she use to complete her table? X: 14 Y: 12 Z: 12 X: 12 Y: 12 Z: 10 X: 12 Y: 10 Z: 12 X: 12 Y: 12 Z: 14
X: 12 Y: 12 Z: 10
Mark creates a graphic organizer to review his notes about electrical force. Which labels belong in the regions marked X and Y? X: Decreasing to half will quadruple force Y: Doubling will double force X: Doubling will cut force in half Y: Decreasing to half will cut force in half X: Doubling will double force Y: Decreasing to half will quadruple force X: Decreasing to half will double force Y: Doubling will cut force in half
X: Decreasing to half will quadruple force Y: Doubling will double force
An electric field around two charged objects is shown. What are the charges of objects X and Y? X: negative Y: positive X: positive Y: positive X: negative Y: negative X: positive Y: negative
X: positive Y: negative
The diagram shows a charge moving into an electric field. The charge will most likely leave the electric field near which letter? W X Y Z
Y
The diagram shows the electric field in the vicinity of a charge. At which point is the electric field strongest? W X Y Z
Y
The table shows the charges and the distance between five different pairs of objects. If the force between two charges, q, separated by a distance, d, is F, what is the list of the other forces, from greatest to least? Y, Z, W, X Y, W, X, Z Z, Y, W, X Z, X, W, Y
Y, W, X, Z
Four pairs of parallel plates are charged. An electron in each pair of plates is moved from the positive to the negative plate. The table shows the electric field and distance between the plates in each pair. Which lists the pairs of plates in order from least to greatest in terms of the work done to move the electron? W, X, Y, Z W, X, Z, Y Z, Y, X, W Z, W, X, Y
Z, W, X, Y
Which is a device that stores electric charge by separating positive and negative charges? a conductor a dielectric a resistor a capacitor
a capacitor
Electric field lines can never cross. What would crossed electric field lines indicate? a field pointing in two directions an attractive force on a charge a nonuniform area of the field a place where the field strength is zero
a field pointing in two directions
Which best describes the materials that make up an electrical cord? a metallic conductor lacking free electrons surrounded by a rubber insulator with free electrons a metallic conductor with free electrons surrounded by a rubber insulator lacking free electrons a metallic insulator with free electrons surrounded by a rubber conductor lacking free electrons a metallic insulator lacking free electrons surrounded by a rubber conductor with free electrons
a metallic conductor with free electrons surrounded by a rubber insulator lacking free electrons
A circuit featuring multiple paths through which current can flow is best classified into which category? a series circuit an open circuit a parallel circuit a short circuit
a parallel circuit
After hearing about an accident on his normal route, Mr. Gujral checks for alternate routes to get to work. What type of circuit does this traffic situation model? a series circuit because there is more than one path a series circuit because there is only one path a parallel circuit because there is more than one path a parallel circuit because there is only one path
a parallel circuit because there is more than one path
An electric field is represented by the force on which particle? a neutron a dipole a negative test charge a positive test charge
a positive test charge
A circuit that has only a single path for current to flow through is best classified into which category? a series circuit an open circuit a parallel circuit a short circuit
a series circuit
What is the unit for measuring electric current? volt ampere ohm coulomb
ampere
Moira is drawing the electric field lines around a pair of charges. One charge is positive, and the other charge is negative. How should she draw the field lines? away from each charge and meeting in the middle away from each charge and curving away from one another away from the positive charge and toward the negative charge away from the negative charge and toward the positive charge
away from the positive charge and toward the negative charge
Jonas sees this symbol in a circuit diagram. Which circuit component does the symbol represent? resistor bulb battery voltmeter
battery
What is the amount of charge a capacitor can store per volt of potential difference? permittivity dielectric constant capacitance electric potential energy
capacitance
Pearl labels a diagram of a charged capacitor as shown. Which change would correct the error in the diagram? changing +2Q to +Q changing +2Q to -2Q reversing the direction of the arrows reversing the labels for Conductors and Insulator
changing +2Q to +Q
Liana draws a diagram to show the direction of the electric force acting on a charged particle in a uniform electric field. Which change would make the diagram correct? changing the charge to negative making the field lines point down changing the force to point right removing the force arrow
changing the force to point right
Which factors affect the electrical force between two objects? mass and distance between them charge and distance between them mass and electric field strength charge and mass
charge and distance between them
Through which element would someone most likely receive a shock? iodine (I) sulfur (S) phosphorus (P) chromium (Cr)
chromium (Cr)
What is the continuous flow of electric charge? voltage resistance potential difference current
current
The insulating material placed between the conducting plates of a capacitor is a(n)
dielectric
What is the measure of a specific material's ability to insulate charges from each other? permittivity dielectric constant capacitance potential difference
dielectric constant
A pair of opposite electric charges of equal magnitude is called a(n) dipole. point charge. electric field. field line.
dipole.
What is a path through which electric charges travel? electric circuit resistance voltage electric current
electric circuit
The area around a charged object that can exert a force on other charged objects is a(n) _________. electric field field line conductor electric potential energy
electric field
Which is the electric potential energy of a charged particle divided by its charge? electric field electric field line electric potential electric potential difference
electric potential
While solving a problem, Sue calculates an answer that has the units . Which quantity did Sue find for her answer? electric potential energy electric field work electric potential difference
electric potential difference
Which is the work required to move a charge? electric field electric field line electric potential electric potential energy
electric potential energy
While solving a problem, Tran calculates an answer that has coulomb-volts as the units. Which quantity did Tran calculate? electric potential energy electric potential difference electric field electric potential
electric potential energy
What is the SI unit for capacitance? farad (F) volt (V) joule (J) ampere (A)
farad (F)
When studying atoms, scientists can ignore the _____________ force between charged particles that make up the atoms because it is many millions of times smaller than other forces in the atom.
gravitational
Which changes would cause an increase in the resistance of a wire? Check all that apply. increasing its temperature decreasing its temperature using a longer wire using a shorter wire using a thicker wire using a thinner wire
increasing its temperature using a longer wire using a thinner wire
A material that restricts the flow of electricity or thermal energy is a(n)
insulator
What is the direction of the electric field at a point directly to the left of a positive charge, Q? up down left right
left
A positive charge, q1, of 5 µC is 3 × 10-2 m west of a positive charge, q2, of 2 µC. What is the magnitude and direction of the electrical force, Fe, applied by q1 on q2? magnitude: 3 N direction: east magnitude: 3 N direction: west magnitude: 100 N direction: east magnitude: 100 N direction: west
magnitude: 100 N direction: east
What is the unit for resistance? volt ampere ohm coulomb
ohm
A noncontinuous loop that prevents the flow of current is a(n) ____ circuit.
open
What is the measure of how much a material resists the formation of an electric field? permittivity dielectric capacitance resistance
permittivity
The direction of electrical force is based on the fact that like charges will _____ each other.
repel
What is the tendency of a material to oppose the flow of charge? voltage resistance potential difference current
resistance
A disrupted circuit in which the current bypasses its proper path is a(n) _____ circuit.
short
Which quantities are equal to sum of the individual values within a circuit? the current in a parallel circuit and the voltage in a series circuit the resistance in a parallel circuit and the current in a series circuit the resistance in a parallel circuit and the voltage in a series circuit the voltage in a parallel circuit and the resistance in a series circuit
the current in a parallel circuit and the voltage in a series circuit
The circuit diagram shows a circuit containing several different components. Which correctly describes the number of one type of component in this circuit? two batteries two switches three bulbs three resistors
three resistors
Tracy scuffs her socked feet across a carpet. When she touches a doorknob, she gets a small shock. How did Tracy become charged? through friction between her hand and the doorknob through friction between her feet and the carpet through conduction between her hand and the doorknob through conduction between her feet and the carpet
through friction between her feet and the carpet
Why are the plates in a capacitor parallel to each other? to allow each plate to become positively charged to form a uniform electric field between the plates to establish a potential difference between the plates to allow each plate to hold the same amount of charge
to form a uniform electric field between the plates
Suchita sees this symbol shown in a circuit diagram. What is the purpose of the component represented by the symbol? to measure current to measure voltage to provide electrical energy to use electrical energy
to measure voltage
Which pair does NOT have an electric force between them? a positive object and negative object two positive objects two neutral objects two negative objects
two neutral objects
What is the direction of the electric field at a point directly below a negative charge, Q? up down left right
up
