AnswersELPGEQ2 MJ Science 3 - 2002100 HCPS v24Magnets and Magnetism

Electromagnetism Answers

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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.
2
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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?
3

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
4

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.
5

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.
6

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
7

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

A
magnetic field
B
solenoid
C
electron flow
D
electromagnet
8

What is a solenoid?

A
a current-carrying wire with many coils
B
a current-carrying wire that is straight
C
a tool used to measure magnetism
D
a tool used to measure current
9

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
10

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

A
A thin copper colored bar.
Option A
B
A copper colored coil with 2 turns.
Option B
C
A copper colored coil with 5 turns.
Option C
D
A thick copper colored bar.
Option D

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