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Electromagnetism — Quiz Answers

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1
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Which wire, when current flows through it, would be surrounded by the strongest magnetic field?

A
Image with description A thin copper colored bar.
B
Image with description A copper colored coil with 2 turns.
C
Image with description A copper colored coil with 5 turns.
D
Image with description A thick copper colored bar.
2
Free Preview

What is a solenoid?

A
a tool used to measure current
B
a tool used to measure magnetism
C
a current-carrying wire that is straight
D
a current-carrying wire with many coils
3

What is the term for producing a current by moving a wire through a magnetic field?

A
flowing induction
B
solenoid induction
C
coiled induction
D
electromagnetic induction
4

When a conductor is passed through a magnetic field, a current is induced in the ______.

A
magnetic field.
B
conductor.
C
area above the magnetic field.
D
area above the conductor.
5

A current is induced in a wire by moving the wire through a magnetic field. Which is one factor that affects the direction of the current?

A
the direction of the needle on an ammeter
B
the direction in which the wire moves
C
the type of magnet
D
the thickness of the wire
6

Assuming a current is flowing, what increases the strength of the magnetic field of a coiled electrical wire?

A
changing the direction of the current flow
B
adding more coils to the wire
C
straightening the wire
D
stopping the current
7

If the current in each wire is the same, which wire produces the strongest magnetic field?

A
a wire that is 1 mm thick and not coiled
B
a wire that is 2 mm thick and not coiled
C
a 1-mm-thick coiled wire with ten loops
D
a 2-mm-thick coiled wire with two loops
8

A compass needle normally points toward Earth’s magnetic pole, which is near the North Pole. Which best explains why the needle moves away from the pole when it comes close to a current-carrying wire?

A
Magnetism surrounding the wire draws the needle toward the wire.
B
Current within the wire weakens the magnetic force of the pole.
C
Current within the wire draws the needle toward the wire.
D
Magnetism surrounding the wire weakens the magnetic force of the pole.
9

Linus builds an electrical circuit with a battery and with wires that carry the current. As the battery weakens, the current also weakens. How does this affect the magnetic field around the wires?

A
The field changes direction.
B
The field gets weaker.
C
The field gets stronger.
D
The field disappears completely.
10

Which is produced around a wire when an electrical current is in the wire?

A
solenoid
B
electromagnet
C
electron flow
D
magnetic field
11

What is the term for producing a current by moving a wire through a magnetic field?

A
solenoid induction
B
flowing induction
C
electromagnetic induction
D
coiled induction
12

Assuming a current is flowing, what increases the strength of the magnetic field of a coiled electrical wire?

A
adding more coils to the wire
B
straightening the wire
C
changing the direction of the current flow
D
stopping the current
13

Which is produced around a wire when an electrical current is in the wire?

A
magnetic field
B
electron flow
C
solenoid
D
electromagnet
14

If the current in each wire is the same, which wire produces the strongest magnetic field?

A
a 1-mm-thick coiled wire with ten loops
B
a wire that is 1 mm thick and not coiled
C
a wire that is 2 mm thick and not coiled
D
a 2-mm-thick coiled wire with two loops
15

A current is induced in a wire by moving the wire through a magnetic field. Which is one factor that affects the direction of the current?

A
the type of magnet
B
the direction of the needle on an ammeter
C
the direction in which the wire moves
D
the thickness of the wire
16

Which wire, when current flows through it, would be surrounded by the strongest magnetic field?

A
Image with description A thin copper colored bar.
B
Image with description A copper colored coil with 5 turns.
C
Image with description A copper colored coil with 2 turns.
D
Image with description A thick copper colored bar.
17

Linus builds an electrical circuit with a battery and with wires that carry the current. As the battery weakens, the current also weakens. How does this affect the magnetic field around the wires?

A
The field disappears completely.
B
The field gets stronger.
C
The field changes direction.
D
The field gets weaker.
18

When a conductor is passed through a magnetic field, a current is induced in the ______.

A
area above the conductor.
B
magnetic field.
C
conductor.
D
area above the magnetic field.
19

A compass needle normally points toward Earth’s magnetic pole, which is near the North Pole. Which best explains why the needle moves away from the pole when it comes close to a current-carrying wire?

A
Magnetism surrounding the wire weakens the magnetic force of the pole.
B
Current within the wire weakens the magnetic force of the pole.
C
Magnetism surrounding the wire draws the needle toward the wire.
D
Current within the wire draws the needle toward the wire.
20

What is a solenoid?

A
a current-carrying wire with many coils
B
a tool used to measure current
C
a current-carrying wire that is straight
D
a tool used to measure magnetism

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