End of unit 9

In order to magnetize an object for electromagnetism, it needs to have iron or steel (ex. a rod or nail).

• True

• False

Electricity is needed for electromagnets.

• True

• False

Electromagnets need a power source.

• True

• False

Electromagnets do NOT have a north and south pole.

• True

• False

Electromagnets can be turned on and off.

• True

• False

What are the components of the electromagnets?

• battery, wire and bulb

• battery , copper wire and paper clips

• battery, copper wire and iron nail

• battery, wire and aluminum

Electric currents produce _____________

• electron clouds

• magnetic fields

• sound waves

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

Surrounding every magnet is a __________  __________.

• magnetic field
• electrical current
• another magnet
• an enemy

What are the ends of a magnet called?

• East and west poles
• Left and Right ends
• North and South ends
• North and South poles