Electromagnetism CHECKPOINT

The diagram shows a device made up of a battery, some wire, and an iron core. Which type of device is shown?

• an electric generator

• a permanent bagnet

• a bar magnet

• an electromagnet

Tags

NGSS.MS-PS2-3

Which machine uses magnetism to produce electricity?

• electromagnet

• electric generator

• motor

• compass

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Which objects would you combine to build an electromagnet?

• compass, source of electric current, copper wire

• battery, generator, steel screw

• copper wire, source of electric current, steel screw

• battery, light bulb, plastic straw

Tags

NGSS.MS-PS2-3

What will happen if a bar magnet is moved through a coil of wire?

• The bar magnet will lose its magnetism.

• An electric current will be generated in the wire.

• The wire will become an electromagnet.

• An electric current will be generated in the magnet.

Tags

NGSS.HS-PS2-5

Which diagram best identifies how an electric current is produced?

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In an electromagnet, a current is passed through loops of wire that surround a core.  Which material would be best to use as the core of an electromagnet?

• aluminum paper clip

• pen

• piece of chalk

• an iron nail

Tags

NGSS.MS-PS2-3

A student coils a copper wire around a bar magnet. Which action will cause the device to generate electricity?

• The student connects the copper wire to a light bulb.

• The student insulates the copper wire with plastic.

• The student uses a horseshoe magnet instead of a bar magnet.

• The student moves the bar magnet through the copper wire coils.

Tags

NGSS.HS-PS2-5

Which diagram best represents the lines of the magnetic field that pass through Points 1 and 2 of the electromagnet?

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Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Which diagram represents a magnet creating an electric current?

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Which statement best compares a permanent magnet and an electromagnet?

• A permanent magnet has a north pole and a south pole, but an electromagnet only has a south pole.

• A permanent magnet has a fixed magnetic field strength but the magnetic field strength of an electromagnet can be changed.

• A permanent magnet requires an external source of energy, but an electromagnet produces its own energy.

• The magnetic field lines from a permanent magnet emerge from the north pole, but they emerge from the south pole of the electromagnet.

Tags

NGSS.MS-PS2-3