Electricity and Magnetism

Conduction is the process of charging an object without touching it.

• true
• false

If you cut a magnet in half, what happens to the poles?

• One half gets the North Pole, the other half gets the South Pole
• Both halves get only a North Pole
• Both halves get only a South Pole
• Both halves get a North pole and a South Pole

A particle that carries a negative electric charge is called a(n) ______.

• neutron
• atom
• proton
• electron

Magnets on refrigerator cannot be turned off. Which type of magnets they belong?

• electromagnets

• battery

• permanent magnets

• copper wire

This is a picture of a simple electromagnet. How can the electromagnet be made stronger?

• Add more coils of wire to the nail.
• Use a smaller battery.
• Reverse the poles of the magnet.
• Remove all the coils and the nail.

What are the components of the electromagnets?

• battery, wire and bulb

• battery , copper wire and plastic bottle

• battery, copper wire and iron nail

• battery, wire and aluminum

What would happen if you took one end of the wire off the battery?

• The nail will be a magnet.

• The nail would no longer be a magnet

• Nothing will happened.

• The nail will heats up.

What kind of magnet can be turned on and off?

• refridgerator magnet
• electromagnet
• magnetite
• iron

When you charge an electroscope by touching it with a charged balloon, the process is called _____.

• friction
• conduction
• induction
• grounding

An electromagnet's poles may be reversed by:

• decreasing the voltage of the coil
• increasing the number of coils
• changing the direction of current flow
• altering the material used to make the coils