AnswersPhysical ScienceElectricity and Magnetism

Electricity and Magnetism — Test Answers

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1
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Which shows the pieces after the magnet is cut?

A
Image with description 2 pieces of broken magnet with a jagged edge on the inside side of each piece. On the left a piece labeled N S from left and on the right a piece labeled S N from left.
B
Image with description 2 pieces of broken magnet with a jagged edge on the inside side of each piece. On the left a piece labeled S and on the right a piece labeled N.
C
Image with description 2 pieces of broken magnet with a jagged edge on the inside side of each piece. On the left a piece labeled N and on the right a piece labeled S.
D
Image with description 2 pieces of broken magnet with a jagged edge on the inside side of each piece. On the left a piece labeled N S from left and on the right a piece labeled N S from left.
2
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What do the arrows represent?

A
thermal energy
B
the magnetic field
C
light energy
D
the electric field
3

At which position would the electric force be greatest?

A
1
B
2
C
3
D
4
4

What is an advantage of series circuits?

A
If one bulb goes out, the other bulbs still shine.
B
Adding more batteries will increase the current.
C
There is more than one path for charges to flow.
D
Light bulbs get dimmer as more bulbs are added.
5

Which will a positively charged object attract?

A
an object that has a negative charge
B
an object that has no charge
C
an object that has a smaller positive charge
D
an object that has a larger positive charge
6

An object that is made of which material is likely to be attracted to a magnet?

A
nickel
B
nitrogen
C
plastic
D
paper
7

Which would ultimately cause the armature in an electric motor to spin?

A
The gap in the commutator closes.
B
The current in the armature is reversed.
C
The current in the armature stops.
D
The commutator loses contact with the brushes.
8

What is the resistance of a clock if it has a current of 0 point 3 0 cap A and runs on a 9 point 0 -V battery?

A
30 cap omega
B
​0.033 Ω
C
9 point 3 cap omega
D
​2.7 Ω
9

Which device manages the flow of current in an electric circuit?

A
the light bulb
B
the battery
C
the wire
D
the switch
10

Which statement correctly describes Earth’s magnetic field?

A
Compasses point toward a magnetic pole that is a north pole.
B
A compass can lead a hiker to the geographic North Pole.
C
Field lines circle Earth from east to west.
D
The magnetic pole near the South Pole is a north pole.
11

How are the current and resistance related when the voltage of a circuit is constant?

A
The current doubles when the resistance doubles because they are directly proportional.
B
The current is cut in half when the resistance doubles because they are directly proportional.
C
The current doubles when the resistance doubles because they are inversely proportional.
D
The current is cut in half when the resistance doubles because they are inversely proportional.
12

Ohm’s law describes the relationship between which quantities?

A
current, voltage, and resistance
B
voltage, resistance, and ohms
C
amperes, ohms, and current
D
resistance, current, and amperes
13

What causes the poles of the electromagnet in an audio speaker to repeatedly switch directions?

A
a device that opens and closes a circuit
B
a metal striker that pulls on the magnet
C
a diaphragm that vibrates around the magnet
D
a current that rapidly switches direction
14

Nina is working with electricity and shortens the wires through which the current is flowing. What is Nina most likely trying to accomplish?

A
decrease resistance
B
convert electric energy to light
C
convert electric energy to heat
D
increase resistance
15

What happens to an iron bar when it is placed within the coils of a solenoid?

A
It stops the current.
B
It becomes a magnet.
C
It loses its magnetism.
D
It induces a current.
16

What is required for an electric charge to flow through a wire?

A
a balance of electric potential
B
zero resistance in the wire
C
high resistance in the wire
D
a difference in electric potential
17

Potential difference is measured in which units?

A
volts
B
currents
C
amps
D
watts
18

How are the magnetic field lines near the south pole of a magnet affected when a second south pole is brought near it?

A
The field lines bend away from the second south pole.
B
The field lines overlap with the lines from the second south pole.
C
The field lines combine with the lines around the second south pole.
D
The field lines bend toward the second south pole.
19

In a movie, a character cuts a wire, which stops the countdown timer of a bomb. What does cutting the wire do to the circuit?

A
It opens the circuit so that electric charges do not flow to the timer.
B
It closes the circuit so that electric charges flow to the timer.
C
It opens the circuit so that electric charges flow to the timer.
D
It closes the circuit so that electric charges do not flow to the timer.
20

How does increasing the distance between charged objects affect the electric force between them?

A
The electric force decreases because the distance has a direct relationship to the force.
B
The electric force decreases because the distance has an indirect relationship to the force.
C
The electric force increases because the distance has an indirect relationship to the force.
D
The electric force increases because the distance has a direct relationship to the force.

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