Physics B Electricity and Magnetism
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 × 10^0 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
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 point charge of 5.0 × 10-7 C moves to the right at 2.6 × 105 m/s in a magnetic field that is directed into the screen and has a field strength of 1.8 × 10-2 T. What is the magnitude of the magnetic force acting on the charge? 0 N 2.3 × 10-3 N 23 N 2.3 × 1011 N
2.3 × 10^-3 N
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 × 10^8 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.)
215,760
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 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
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 × 10^1 C
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.
32
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
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 × 10^4 V
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
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
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.
A charged object touches a neutral object.
Two bar magnets are labeled A and B. The ends of each magnet are numbered 1 or 2, but the poles are not labeled. When A1 is brought near B1, the bars repel. Which conclusion is best supported by the data? A1 is the north pole of a magnet, and B1 is the south pole of a magnet. A1 is the north pole of a magnet, and B1 is the north pole of a magnet. A1 and B1 are opposite poles, but there is not enough information to tell which ones. A1 and B1 are like poles, but there is not enough information to tell whether they are north poles or south poles.
A1 and B1 are like poles, but there is not enough information to tell whether they are north poles or south poles.
Humberto builds two circuits using identical components. Circuit 1: A series circuit with three lightbulbs Circuit 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.
Roland writes a story in which boaters become stranded on a sandy island. In the story, they set about collecting materials to create semiconductors to repair computer components in their radio. Which problem is likely to be the most difficult for Roland's characters to overcome? There are no semiconductor elements on the island. Any substances they find are too impure. They lack materials to make a p-type semiconductor. No conductors are available to connect the components
Any substances they find are too impure.
Barton conducts an experiment using three metallic bars that might be magnets. The bars are labeled A, B, and C. The ends of each bar are numbered 1 or 2. He places the end of one bar close to an end of a second bar and records his results in the table shown. Based on the data, which prediction should he expect to occur? A2 repels B1. C2 attracts B2. B1 repels C1. A1 attracts C2.
C2 attracts B2.
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.
Which equation is used to calculate the magnetic force on a charge moving in a magnetic field? F = |q|vBcos F = |q|vBsin F = |q|Bcos F = |q|Bsin
F = |q|vBsin
Which equation relates charge, time, and current?
I= (change in) q/t
How does the north pole of a magnet respond to the poles of other magnets? It attracts both north and south poles. It repels both north and south poles. It attracts the north pole and repels the south pole. It attracts the south pole and repels the north pole.
It attracts the south pole and repels the north pole.
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. 1. Marta and Cato are walking together. Each has one flower and one box of candy. 2. Juan offers Cato a huge bouquet of flowers, but Cato can't take it because his hands are full. 3. Cato hands his flower to Marta and then turns to Juan to take the bouquet. 4. 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 the offer of flowers represents a charged object that causes an electron (a flower) to transfer from one object to another.
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.
Which statement describes the magnetic field inside a bar magnet? It points from north to south. It points from south to north. It forms loops inside the magnet. There is no field within the magnet.
It points from south to north.
A magnetically soft material is placed in a strong magnetic field. What is the most likely outcome? It will become a permanent magnet because the domains will remain aligned. It will become a temporary magnet because the domains will remain aligned. It will become a permanent magnet because the domains will easily realign. It will become a temporary magnet because the domains will easily realign.
It will become a temporary magnet because the domains will easily realign.
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.
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
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.
A positive rod is placed to the left of sphere A, and the spheres are separated. Which best describes the spheres? a. Sphere A is negative and sphere B is positive because protons from sphere A are attracted to the rod and move to sphere B. 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. c. 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. d. 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.
Which statement is true for both types of transistors? Current flows from the collector to the emitter. Current flows from the base to the emitter. The base is between the collector and the emitter. The base is a p-type semiconductor.
The base is between the collector and the emitter.
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 greater than the gravitational force, and both forces are attractive. The electrical force is 1.2 × 1036 times greater than the gravitational force, but only the gravitational force is attractive. The electrical force is 8.0 × 10-37 times greater than the gravitational force, and both forces are attractive. The electrical force is 8.0 × 10-37 times greater than the gravitational force, but only the gravitational force is attractive.
The electrical force is 1.2 × 10^36 times greater than the gravitational force, but only the gravitational force is attractive.
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.
Before beginning an experiment, Mrs. Wilson warns her science class not to drop the bar magnets on the floor. What is the most likely reason for Mrs. Wilson's warning? The magnet might lose its magnetism. The magnet might make a startling noise. The magnet might become stuck to the floor. The magnet might cause the floor to become magnetic.
The magnet might lose its magnetism.
The north pole of a strong magnet is dragged down an iron nail from the top to the point 50 times. What will most likely happen when the nail is brought near a pile of small paper clips? The nail will not pick up any paper clips because its domains are not aligned. The nail will not pick up any paper clips because its domains have been aligned. The nail will pick up some paper clips because its domains are not aligned. The nail will pick up some paper clips because its domains have been aligned.
The nail will pick up some paper clips because its domains have been aligned.
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.
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.
Which equations should be used only in a uniform electric field? Check all that apply. U = qEd V = k W = qV V = Ed F = qE
U = qEd V = Ed
What is the abbreviation for the SI unit for electric potential? V J C U
V
Which equation is used to calculate the electric potential in an electric field from a point charge? V = k V = k V = V =
V = k(q/d)
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? (switch) W X Y Z
W
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 (+2 arrow is going left and the +3 arrow is going right; the arrows are the same length)
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
The magnetic field 0.01 m from a wire carrying a current of 20 A is 0.004 T. The current in the wire and the distance from the wire are changed, as recorded in the table. Which values belong in cells X and Y of the table? X: 0.008 Y: 0.006 X: 0.0005 Y: 0.024 X: 0.032 Y: 0.00067 X: 0.002 Y: 0.006
X: 0.002 Y: 0.006
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
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
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 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
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
The diagram shows a transistor used in a circuit. (has a signal output and a signal input) What does the diagram show? an NPN transistor used as an amplifier an NPN transistor used as a switch a PNP transistor used as an amplifier a PNP transistor used as a switch
an NPN transistor used as an amplifier
In which type of transistor does current flow from the base to the emitter? an NPN transistor, which has a p-type base an NPN transistor, which has an n-type base a PNP transistor, which has a p-type base a PNP transistor, which has an n-type base
an NPN transistor, which has a p-type base
Angela sees a puzzle that uses a board with 20 holes drilled into it. There are 18 pegs in the holes, and the goal of the puzzle is to move the pegs by hopping them into the open holes until both holes are at one end of the board. How could Angela use the puzzle to model semiconductors? as an n-type semiconductor with the pegs representing electrons and the holes representing positive charges as an n-type semiconductor with the holes representing electrons and the pegs representing positive charges as a p-type semiconductor with the pegs representing electrons and the holes representing positive charges as a p-type semiconductor with the holes representing electrons and the pegs representing positive charges
as a p-type semiconductor with the pegs representing electrons and the holes representing positive charges
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
This diagram shows the magnetic field lines near the ends of two magnets. There is an error in the diagram. (North left south right arrows point up and down) Which change will correct the error in the diagram? changing the N to S reversing the arrows on the left to point toward the N changing the S to N reversing the arrows on the right to point toward the S
changing the S to N
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
What can a transistor do in order to fulfill its function in a circuit? Check all that apply. control which layer is the emitter control its own semiconductance change the dopants in the transistor act like an insulator act like a conductor
control its own semiconductance act like an insulator act like a conductor
What is the continuous flow of electric charge? voltage resistance potential difference current
current
A pair of opposite electric charges of equal magnitude is called a(n) dipole. point charge. electric field. field line.
dipole
A cluster of atoms whose magnetic fields are aligned in the same direction is a magnetic ____________.
domain
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
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
The area around a charged object that can exert a force on other charged objects is an electric
field
When using the right-hand rule to determine the direction of the magnetic field around a current-carrying wire, which part of the right hand points in the direction of the magnetic field? palm fingers back thumb
fingers
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 actions most likely cause the domains within a material to lose their alignment and become more randomized? Check all that apply. heating the material rubbing the material against a magnet passing electricity around the material placing the material in a magnetic field of opposite polarity placing the material near a strong magnet hitting the material
heating the material placing the material in a magnetic field of opposite polarity hitting the material
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
A wire runs left to right and carries a current in the direction shown. (line with point z under it arrow on top pointing right labeled I) What is the direction of the magnetic field at point Z? left right into the screen out of the screen
into the screen
While teaching about transistors, Mr. Mendoza shows a video of a hand pump being used to draw water from a well. He points out how the person primes the pump by pouring a small amount of water into it before the water would start to flow. No matter how much water is used to prime the pump, once started, the pump provides a steady flow of water while the handle is operated. What is Mr. Mendoza using the hand pump to model? its use as a switch to make a small signal into a large signal its use as an amplifier to make a small signal into a large signal its use as a switch to turn on a large current using a small current its use as an amplifier to turn on a large current using a small current
its use as a switch to turn on a large current using a small current
The diagram shows a negative charge moving in a magnetic field. (arrows pointing downward with point v in the middle as an open circle ella is freaking mean) In which direction is the magnetic force acting on the charge? right left into the screen out of the screen
left
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
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
magnitude: 4 × 10^4 N direction: north
A positive charge moving up enters a magnetic field pointing out of the screen. What is the direction of the magnetic force on the charge? up down right left
right
A student uses the right-hand rule as shown. (thumbs up with fingers facing outward) What is the direction of the magnetic field in front of the wire closest to the student? up right down left
right
A disrupted circuit in which the current bypasses its proper path is a(n) ______ circuit.
short
The diagram shows a transistor used in a circuit. The transistor in the circuit is used to . (drawing says light on, red arrow pointing down on left)
switch a current
The name of the SI unit for magnetic field strength, such as that created around a current-carrying wire, is the ___________.
tesla
Which is a dopant for a semiconductor that conducts electricity due to the movement of positive charges? thallium arsenic phosphorus antimony
thallium
While teaching about transistors, Mrs. Kwon shows a video of a hand pump being used to draw water from a well. She points out how the person primes the pump by pouring a small amount of water into it before the water would start to flow. What does the water used to prime the pump represent? the current in the emitter that amplifies the signal the current in the base that amplifies the signal the current in the collector that turns the transistor on the current in the base that turns the transistor on
the current in the base that turns the transistor on
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
When using the right-hand rule to determine the direction of the magnetic force on a charge, which part of the hand points in the direction that the charge is moving? palm fingers back thumb
thumb
Suchita sees this symbol shown in a circuit diagram. What is the purpose of the component represented by the symbol? (It looks like a V) to measure current to measure voltage to provide electrical energy to use electrical energy
to measure voltage
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
two negative objects two positive objects a negative object and a positive object
What is the direction of the electric field at a point directly below a negative charge, Q? up down left right
up