Electromagnetism Test

This object is an

• electromagnet

• electric motor

• electric generator

• galvanometer

Surrounding every magnet is a __________ .

• magnetic field

• electrical current

• magnetic poles

• Magnetosphere

Magnetism is a result of _________ that _________.

• protons, change directions

• protons, rearrange

• electrons, line up

• electrons, exchange charges

Frank wants to make a simple electromagnet. Which of these does Frank need to have to create the electromagnet?

• iron filings

• magnet

• battery

• lightbulb

What will most likely happen to the compass needle when the switch is closed and the circuit parts are connected to the battery?

• It will turn around once because the completed circuit reverses Earth's magnetic field.

• It will point toward the batteries because they are the only circuit part that can be magnetic.

• It will move because the current in the completed circuit will create a magnetic field.

• None of the above

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

• a magnetic field

• an electric field

• a generated field

• an electronic field

Where is the force of attraction the strongest on a magnet?

• at the poles
• in the middle
• above the magnet
• below the magnet

What do we know about Earth's Magnetosphere (magnetic field)?

• It is likely caused my the molten iron core of the Earth.

• It protects us from solar winds.

• It causes the auroras.

• all of the above.

How can you increase the strength of an electromagnet?

• Increase the number of coils.

• increase the voltage (size) of the battery

• increase the size of the iron core

• all of the above

What can an electromagnet do that a permanent magnet cannot do?

• It is stronger than any permanent magnet.
• It can be turned on and off
• They can glow in the dark