physicsdfkcbek

A positive charge of 6.0 × 10-4 C is in an electric field that exerts a force of 4.5 × 10-4 N on it. What is the strength of the electric field?

.75

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 1.7 A.

1.7

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 192 Ω.

192

A charge of 7.2 × 10-5 C is placed in an electric field with a strength of 4.8 × 105. If the electric potential energy of the charge is 75 J, what is the distance between the charge and the source of the electric field? Round your answer to the nearest tenth.

2.2

The strength of the electric field 0.5 m from a 6 µC charge is 215,760 N/C. (Use k = 8.99 × 109 N• and round answer to the nearest whole number.)

215.760

A 8 µC charge q1 and a 10 µC charge q2 are 0.05 m from the x-axis. A 6 µC charge q3 is 0.12 m from the y-axis. The distances d13 and d23 are 0.13 m. Find the magnitude and direction of the resulting vector R. Round to one decimal place. The magnitude is N. The direction is °.

53 N 3

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 6.1 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 62.5 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 72 J.

72

In 12 s, a wire delivers 96 C of charge. The current in the wire, to the nearest whole number, is 8 A.

8

Force F acts between a pair of charges, q1 and q2, separated by a distance d. For each of the statements, use the drop-down menus to express the new force in terms of F. q1 is halved, q2 is doubled, but the distance between the charges remains d. q1 and q2 are unchanged. The distance between the charges is doubled to 2d. q1 is doubled and q2 is tripled. The distance between the charges remains d.

F F/4 6F

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

a

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.

a

A pair of opposite electric charges of equal magnitude is called a(n) dipole. point charge. electric field. field line.

a

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

a

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

a

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.

a

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.

a

Keisha analyzes this circuit diagram. Which circuit component should Keisha use to start or stop the current in the circuit? W X Y Z

a

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

a

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

a

What is the SI unit for capacitance? farad (F) volt (V) joule (J) ampere (A)

a

What is the abbreviation for the SI unit for electric potential? V J C U

a

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

a

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

a

Which quantities are equal to total 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

a

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

a

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.

a c

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

a c f

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.

b

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

b

An element becomes a positively charged ion when it loses protons. loses electrons. gains electrons. gains neutrons.

b

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.

b

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

b

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

b

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

b

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

b

What is the tendency of a material to oppose the flow of charge? voltage resistance potential difference current

b

What is the value of a charge that has an electric potential of 325 V and an electric potential energy of 0.025 J? 7.7 × 10-4 C 7.7 × 10-5 C 1.3 × 103 C 1.3 × 104 C

b

Which equation is used to calculate the electric potential in an electric field from a point charge? V = k V = k V = V =

b

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.

b c d e

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.

b c f

An electric force exists between which pair of objects? Check all that apply. a neutral object and a negative object two negative objects a neutral object and a positive object two positive objects a negative object and a positive object two neutral objects

b d e

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.

b d e

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

c

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

c

Charges of +5C and −9C are at a distance of 1m from each other. Which diagram represents the force between the two charges? Image for option 1 Image for option 2 Image for option 3 Image for option 4

c

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.

c

Jonas sees this symbol in a circuit diagram. Which circuit component does the symbol represent? resistor bulb battery voltmeter

c

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.

c

What is the amount of charge a capacitor can store per volt of potential difference? permittivity dielectric constant capacitance electric potential energy

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

c

What is the electrical force between q1 and q2? Recall that k = 8.99 × 109 N•. 4.3 × 1010 N 3.5 × 1010 N -5.4 × 1010 N -5.8 × 1010 N

c

What is the unit for resistance? volt ampere ohm coulomb

c

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.

c

Which is the electric potential energy of a charged particle divided by its charge? electric field electric field line electric potential electric potential difference

c

Which vector best represents the net force acting on the +3C charge in the diagram?

c

Which vector best represents the net force acting on the +3C charge in the diagram? A B C D

c

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

d

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

d

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

d

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

d

A negative charge, q1, of 6 µC is 0.002 m north of a positive charge, q2, of 3 µC. What is the magnitude and direction of the electrical force, Fe, applied by q1 on q2? magnitude: 8 × 101 N direction: south magnitude: 8 × 101 N direction: north magnitude: 4 × 104 N direction: south magnitude: 4 × 104 N direction: north

d

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.

d

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.

d

Through which element would someone most likely receive a shock? iodine (I) sulfur (S) phosphorus (P) chromium (Cr)

d

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.

d

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

d

Which is a device that stores electric charge by separating positive and negative charges? a conductor a dielectric a resistor a capacitor

d

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.

d

The area around a charged object that can exert a force on other charged objects is an electric field .

field

Use the drop-down menu to answer the question. A student is going to produce static charge in a glass rod by rubbing it with a piece of silk. Which method of transferring charge is being described?

friction

Use the drop-down menus to complete each statement. is the process of charging an object without touching it. is the process of charging a sphere by touching it with a charged rod.

induction conduction

Fill in the blank with either "insulators" or "conductors" to complete the sentence. The conductivity of a material is determined by the number of free electrons. have few or no free electrons.

insulators

The superposition principle states that the net electrical force on a specific charge is equal to the sum of the vector components of the charges applying forces on it.

superposition

Use the drop-down menus to answer each question. How do objects with the same charge interact? How do objects with opposite charges interact? How do uncharged objects interact?

they repel each other they attract each other they have no effect on each other

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

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.

x 12

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

x a

What is the measure of a specific material's ability to insulate charges from each other? permittivity dielectric constant capacitance potential difference

x a

Nolan is making a capacitor using plates that have an area of 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

x b

An electric field is represented by the force on which particle? a neutron a dipole a negative test charge a positive test charge

x c

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 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