Magnetism and Electricity

Small particles of metal are scattered near a bar magnet to show the pattern of the magnetic field. Which metal is suitable?

• aluminium

• copper

• iron

• brass

A strong electromagnet is used to attract pins.

What happens when the current in the coil is halved?

• No pins are attracted.

• Fewer pins are attracted.

• The same number of pins is attracted.

• Many more pins are attracted.

The strongest parts of the magnet are ...

• fronts

• backs

• poles

• middle

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Why does the compass needle move at different locations?

• Because the needle is attracted to the magnetic field produced by the magnet

• Because north is up

• Because it is being attracted to the Magnetic North Pole

• Because north is down

Tags

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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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What kind of circuit is this?

• series
• parallel

How is a permanent magnet DIFFERENT from a temporary magnet?

• A permanent magnet can pick up paperclips.
• A permanent magnet has poles.
• A permanent magnet has a magnetic field.
• A permanent magnet keeps its magnetism for a long time.

In order to make an electromagnet, you need a  

• battery, nail, and magnet
• battery, wire, and nail
• magnet, nail, and wire
• all of the above

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Static electricity is the build up of ___________.

• protons

• electrons

• neutrons

• none of the above

Which device uses mechanical energy to produce electrical energy?

• Electric Motor
• Magnet
• Generator
• Solar Cell

Tags

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