AnswersPhysical ScienceElectricity and Magnetism

Electricity and Magnetism — Test Answers

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1
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How can Dante correct the diagram?

A
He can place the wire between the poles of the magnet and not move it.
B
He can move the wire upward instead of downward.
C
He can change the wire from coiled to straight.
D
He can connect the wire to both ends of the ammeter.
2
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What label should Mateo place in the marked cell?

A
Provides electrical energy
B
Uses electrical energy
C
Measures electric current
D
Controls electric current
3

What do the arrows represent?

A
light energy
B
thermal energy
C
the magnetic field
D
the electric field
4

Which statement should she place in the region marked X?

A
The objects do not touch.
B
The objects have the same charge.
C
Electrons move between objects.
D
The objects develop opposite charges.
5

At which position would the electric force be greatest?

A
1
B
2
C
3
D
4
6

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 and on the right a piece labeled S.
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 N S from left and on the right a piece labeled N S from left.
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 S and on the right a piece labeled N.
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 S N from left.
7

Which statement correctly describes Earth’s magnetic field?

A
A compass can lead a hiker to the geographic North Pole.
B
The magnetic pole near the South Pole is a north pole.
C
Compasses point toward a magnetic pole that is a north pole.
D
Field lines circle Earth from east to west.
8

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

A
the light bulb
B
the switch
C
the wire
D
the battery
9

Which will a positively charged object attract?

A
an object that has a larger positive charge
B
an object that has a smaller positive charge
C
an object that has no charge
D
an object that has a negative charge
10

Cora, an electrician, wraps a copper wire with a thick plastic coating. What is she most likely trying to do?

A
decrease the wire’s resistance
B
increase the voltage produced by the wire
C
keep the electric potential of the wire balanced
D
keep a current from passing out of the wire
11

Aretha measures a circuit at 110 cap v and 240 cap omega Using Ohm’s law, what can she calculate for the circuit?

A
resistance
B
voltage
C
ohms
D
current
12

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 closes the circuit so that electric charges do not flow to the timer.
D
It opens the circuit so that electric charges flow to the timer.
13

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

A
nickel
B
plastic
C
paper
D
nitrogen
14

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

A
The electric force increases because the distance has an indirect 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 a direct relationship to the force.
D
The electric force decreases because the distance has a direct relationship to the force.
15

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
9 point 3 cap omega
B
​0.033 Ω
C
30 cap omega
D
​2.7 Ω
16

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 is cut in half when the resistance doubles because they are inversely proportional.
D
The current doubles when the resistance doubles because they are inversely proportional.
17

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

A
high resistance in the wire
B
a difference in electric potential
C
zero resistance in the wire
D
a balance of electric potential
18

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

A
It loses its magnetism.
B
It stops the current.
C
It induces a current.
D
It becomes a magnet.
19

What is an advantage of series circuits?

A
There is more than one path for charges to flow.
B
If one bulb goes out, the other bulbs still shine.
C
Light bulbs get dimmer as more bulbs are added.
D
Adding more batteries will increase the current.
20

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

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