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Electromagnetism Answers

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

A
straightening the wire
B
changing the direction of the current flow
C
adding more coils to the wire
D
stopping the current
2
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Dante drew a diagram to show how a wire uses the magnetic field of a magnet to induce an electric current.

Question illustration
A
He can move the wire upward instead of downward.
B
He can connect the wire to both ends of the ammeter.
C
He can change the wire from coiled to straight.
D
He can place the wire between the poles of the magnet and not move it.
3

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
4

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
Current within the wire weakens the magnetic force of the pole.
B
Magnetism surrounding 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 draws the needle toward the wire.
5

Linus builds an electrical circuit with a battery and with wires that carry the current. As the battery weakens, the current also weakens.

A
The field gets stronger.
B
The field gets weaker.
C
The field changes direction.
D
The field disappears completely.
6

Maya sets up two experiments as shown.

Question illustration
A
How does the type of material used in the core affect the strength of an electromagnet?
B
How does the number of loops of wire affect the strength of an electromagnet?
C
How does the speed at which an iron bar is removed from wire loops affect the strength of an electromagnet?
D
How does the thickness of the wire affect the strength of an electromagnet?
7

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
8

How does adding an iron bar to a solenoid affect the magnetic field of the electromagnet?

A
It changes the magnetic field to a current.
B
It changes the magnetic field’s direction.
C
It increases the magnetic field’s strength.
D
It decreases the magnetic field’s strength.
9

Juan makes an adjustment to an electromagnet that causes the electromagnet to lose some of its strength. What did Juan most likely do?

A
He reduced the number of loops in the wire.
B
He increased the number of loops in the wire.
C
He reduced the length of the wire.
D
He increased the length of the wire.
10

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

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