AnswersCSD Summer 2026 PhysicalEarth ScienceLab: Magnetic and Electric Fields

Electromagnetism Answers

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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.
2
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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
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

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?
5

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.
6

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
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 the Compact Muon Solenoid used to study?

A
materials that give off harmful radiation
B
the current produced by different types of magnets
C
different materials that conduct current
D
the particles emitted when atoms collide
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

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.

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