Magnetism and Electromagnetism Slides

Electromagnets

Multiple Choice

What kind of magnet can be turned on and off?

• refridgerator magnet
• electromagnet
• magnetite
• iron

Multiple Choice

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

Multiple Select

Check each of the following that will make an electromagnet more powerful.

• Increase the current in the solenoid: Use a more powerful battery

• Add more loops of wire to the solenoid

• Wind the coils closer together

• Use a stronger ferromagnetic core

Multiple Choice

True or False: A big disadvantage of an electromagnet is that they can be turned on and off.

• True

• False

Multiple Choice

A current carrying wire with many loops is a _____________

• Electromagnet

• Solenoid

• Battery

• Charge

Multiple Choice

A ______________________ is a strong temporary magnet made of a solenoid wrapped around a ferromagnetic core.

• Solenoidmagnet

• Currentmagnet

• Polemagnet

• Electromagnet