Electromagnet

How can the strength of an electromagnet be increased? (mark all that apply)

• increase the current flowing through the coil

• increase the number of coils

• add an amplifier to it

• put iron core inside the coil

Permanent Magnets and Electromagnets are similar in which TWO ways?

• it can be turned off and on

• they both have a north and south pole

• they are surrounded by a magnetic field

What THREE ways are electromagnets different from permanent magnets?

• they can be turned off and on

• they can increase in strength by increasing the current in the wire

• they are smaller in size

• they can change which is the north and south pole

Which part of the electromagnets turned into a magnet when electricity flows through a coiled wire?

• Battery

• Copper wire

• Iron Nail

• Bulb

How are electromagnets different from magnets?

• magnets can be turned on/off
• you can turn an electromagnet on/off
• magnets are more powerful
• magnets have a North and South pole

The compasses will all point _____ when an downward current flows in the wire.

• clockwise

• anticlockwise

• left

• right

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.

How could the experimenter increase the amount of electricity being induced by this experiment?

• Increase the number of coils
• Decrease the number of coils
• Flip the magnet around
• Nothing, the amount of electricity cannot be increased

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.

A paper clip is an example of a:

• insulator

• permanent magnet

• magnetic material

• bar magnet