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Electricity and Magnetism
E&M MCAS Review
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1. Which of the following statements describes the electric force between two oppositely charged particles as they approach each other?
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1 point
The attractive electric force increases.
The electric force becomes repulsive.
The magnitude of the electric force decreases.
The repulsive electric force becomes attractive.
2. A circuit diagram is shown below.
What is the current through the 2 Ω resistor?
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1 point
1.25 A
1.5 A
5.0 A
6.67 A
3. Electric charges can move most easily on which of the following objects?
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glass tubes
metal plates
plastic cups
rubber tires
4. Which of the following conditions results in the buildup of static charge on an object?
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1 point
when neutrons outnumber electrons
when there are more protons than neutrons
when there are more electrons than protons
when all neutrons have been removed from the object
5. Which of the following sets of charges has the greatest attractive force when the charges are equal in magnitude?
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1 point
two like charges placed 1 m apart
two like charges placed 2 m apart
two opposite charges placed 1 m apart
two opposite charges placed 2 m apart
6. A clothes iron is designed to be used with a 220 V outlet. Which of the following will happen if the iron is plugged into a 110 V outlet instead of a 220 V outlet?
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The iron will exceed its maximum power rating.
The internal resistance of the iron will increase.
The iron will use the same energy for a given amount of time.
The current delivered to the iron will be lower than the maximum amount.
7. Which statement describes what most likely occurs when a magnetic compass is placed next to a simple circuit made from a battery, a light bulb, and a wire?
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A magnetic field created by the compass causes the light bulb to stop working.
A magnetic field created by the electric current causes the compass needle to move.
A magnetic field created by the compass increases the current in the electrical circuit.
A magnetic field created by the electric current places negative charges on the compass.
8. When an uncharged balloon is rubbed against dry uncharged hair, electrons move from the hair onto the balloon’s surface. Which table lists the charges of the balloon and the hair after they are moved apart?
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the charges of the balloon are positive and the charges of the hair are negative
the charges of the balloon are negative and the charges of the hair are positive
the charges of the balloon are positive and the hair has no charge
the charges of the balloon are negative and the hair has no charge
9. What is the current flowing through a 60 W light bulb when it is connected to a 120 V source?
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1 point
0.5 A
2.0 A
180 A
7800 A
10. The diagram below shows a parallel circuit with a 4 Ω resistor and a 12 Ω resistor. The voltage between points X and Y is 16 V.
What is the voltage across the 12 Ω resistor?
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1 point
12 V
16 V
36 V
64 V
11. The graph below shows the relationship of voltage versus current for a circuit.
This graph represents the relationship described by which of the following laws?
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1 point
Coulomb’s law
Doppler’s law
Newton’s law
Ohm’s law
12. Which of the following is a purpose of a battery in a circuit?
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to provide voltage
to provide resistance
to turn the circuit on and off
to protect the circuit from too much current
13. A student has a circuit that is missing a component at location X, as shown in the diagram below.
The student wants component Y to warm up after the switch is closed. Which of the following components should the student add to the circuit at location X?
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1 point
Your answer
A.
B.
C.
D.
14. Which of the following statements describes an electric generator?
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1 point
A magnet is rotated through a coil of wire to produce an electric current.
Electric potential in a rotating coil of wire creates a permanent magnet.
An electrical current causes a coil of wire to rotate in a magnetic field.
Forces from a permanent magnet allow a coil of wire to rotate.
15. A neutral balloon is rubbed with a piece of wool cloth. As a result, the balloon has a negative static charge.Which of the following statements best explains why the balloon has a negative charge?
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1 point
The balloon is a conductor.
The balloon is an insulator.
The balloon transfers charges to the cloth.
The balloon receives charges from the cloth.
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