Electromagnetism, Motors, Generators

When we bring the magnets closer together when the forces are repulsive, we observe that

• the magnets stick together

• the poles of the magnets switch

• the magnets move away from each other

• the train car slows down

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NGSS.MS-PS2-3

NGSS.MS-PS2-5

When we switch the direction of the electric current,

• the size of the magnetic field increases

• the sound of the speaker gets softer

• the magnet will repel

• the poles of the electromagnet are reversed

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NGSS.MS-PS2-3

NGSS.MS-PS2-5

When we increase the amount of electricity in a wire

• the magnetic field will increase

• the magnet will attract

• the electrons will heat up

• the car battery will last longer

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NGSS.MS-PS2-3

NGSS.MS-PS2-5

A current is produced when _______________ flow in a circuit.

• protons

• neutrons

• electrons

• nucleons

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NGSS.MS-PS2-3

The south ends of two magnets will _________ each other.

• repel

• attract

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NGSS.3-PS2-3

What does this image show?

• Parallel circuit

• Series circuit

• Magnet

• Electromagnet

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NGSS.MS-PS2-3

Opposite charges do what?

• Attract

• Repel

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NGSS.MS-PS2-3

The area of magnetic force around a magnet is known as its ____________.

• magnetism

• magnetic current

• magnetic field

• electric current

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NGSS.MS-PS2-5

What is/are the difference(s) between a magnet and an electromagnet?

• An electromagnet can be turned on/off.

• A magnet can be turned off.

• An electromagnet is stronger.

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NGSS.MS-PS2-3

A _____________ transforms mechanical energy into electrical energy.

• generator

• electromagnet

• circuit

• magnetic field