Exploring Magnetism and Electromagnetism

Describe how the distance between two magnets affects the magnetic force between them.

• The force increases with distance.

• The force decreases with distance.

• The force remains constant.

• The force is not affected by distance.

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DOK Level 2: Skill/Concept

A student conducts an experiment to determine the factors affecting the strength of an electromagnet. Which variable should be changed to test its effect on the electromagnet's strength?

• The color of the wire

• The number of coils

• The brand of the battery

• The length of the wire

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DOK Level 2: Skill/Concept

What happens to the magnetic field strength when the current in a wire is increased?

• It decreases.

• It remains the same.

• It increases.

• It disappears.

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DOK Level 1: Recall

Which of the following best describes the relationship between electric current and magnetic fields?

• Electric current can create magnetic fields.

• Magnetic fields can create electric current.

• Both A and B

• Neither A nor B

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DOK Level 2: Skill/Concept

A student observes that a compass needle deflects when placed near a current-carrying wire. What does this observation suggest?

• The wire is made of magnetic material.

• The current creates a magnetic field around the wire.

• The compass is faulty.

• The wire is electrically charged.

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DOK Level 2: Skill/Concept

What is the effect of reversing the direction of current in a wire on the direction of the magnetic field around it?

• The magnetic field direction remains unchanged.

• The magnetic field direction reverses.

• The magnetic field disappears.

• The magnetic field strength doubles.

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DOK Level 2: Skill/Concept

To make this electromagnet stronger you could:

• use less wire

• have fewer wire coils around the nail

• have more wire coils around the nail

• use a plastic core

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NGSS.MS-ETS1-2

Which of the following will increase the strength of an electromagnet?

• changing the core to a permanent magnet

• increasing the number of coils

• changing the core to a soft magnet like iron

• increasing the strength of the battery

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NGSS.MS-PS2-3

How can the strength of an electromagnet be increased?

• By decreasing the number of turns in the coil, decreasing the current flowing through the coil, or using a weaker magnetic material as the core.

• By increasing the resistance in the circuit, decreasing the voltage supplied to the coil, or using a non-magnetic material as the core.

• By decreasing the size of the coil, decreasing the number of windings in the coil, or using a non-conductive material as the core.

• By increasing the number of turns in the coil, increasing the current flowing through the coil, or using a stronger magnetic material as the core.

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NGSS.MS-PS2-3

NGSS.MS-PS2-5

While electric current is flowing through a wire, what surrounds the wire?

• a magnetic field
• a glowing light
• neutrons
• protons

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NGSS.MS-PS2-3

NGSS.MS-PS2-5