Review- Electromagnetism

Multiple Choice

The relationship between electricity and magnetism is called _____________.

• Electricity

• Law of Conservation of Energy

• Electromagnetism

• Magnetism

Multiple Choice

A _______________ is a coil that carries an electric current. 

• Solenoid

• Simple Electric Motor

• Electromagnet

• Generator

Multiple Choice

What can be done to increase the number of magnetic objects that an electromagnet picks up?

• Make the wire longer

• Remove the nail from the center of the wire

• Increase the number of coils in the solenoid

• Spread the coils out across the nail

Enlarge the Core

• You can also make an electromagnet stronger by making the iron core bigger.

• A larger diameter of the core means that there is more metal which will further magnify the strength of the magnetic field.

Multiple Choice

Which of these is not a way to increase the magnetism of an electromagnet

• Increase the length of the wire.

• Increase the thickness of the wire.

• Decrease the distance to the power source.

• Increase the distance to the power source.

Multiple Choice

Which of these is not an example of an electromagnet.

• Refrigerator Magnet

• Speakers

• Computer Hard Drive

• Generators

Multiple Select

(Choose all that apply) Which of these would decrease the power of an electromagnet?

• Decrease the distance to the power source.

• Decrease the thickness of the wire.

• Decrease the amount of current running through the wire.

• Decrease the length of the wire.

Multiple Choice

(True of False) An electromagnet is still a magnet when there is not current running through it.

• True

• False

Multiple Choice

How can you increase the magnetic field strength in an electromagnet?

• Increase the number of coils.

• increase the voltage

• increase the current by reducing the resistance of the coil

• all of the above

Multiple Choice

If you brought an unknown pole of a magnet near a North magnetic pole and they repel what is the unknown pole?

• North

• South

• Neutral

• not enough information