Electromagnetism 2

Which of the following has the greatest influence on the strength of an electromagnet?

• The distance of the battery to the core

• The material the core is made of

• The direction the core is facing

• The color of the wire

These magnetic domains are:

• strongly magnetized

• slightly magnetized

• unmagnetized

To make this electromagnet stronger you could:

• use less wire

• have fewer wire coils around the nail

• have more wire coils around the nail

• use a plastic core

When running a current through a wire, what do the blue lines represent?

• The wire spinning

• A magnetic field that was created

• Electrons leaving

• Electricity

Which one represents the magnetic field lines of magnets repelling?

• A

• B

A _______________ is a current-carrying coil of wire with many loops.

• magnet

• electromagnet

• solenoid

• compass

How can a magnet be used to produce an electric current?

• Hold a magnet next to a piece of wire.

• Wrap wire around a magnet.

• Spin the magnet around inside a coil of wire.

A _____________ transforms mechanical energy into electrical energy.

• generator

• electromagnet

• circuit

• magnetic field

What happens to the strength of a magnetic field as you move away from the magnet?

• The strength of the magnetic field increases.

• The strength of the magnetic field doesn't change.

• The strength of the magnetic field is doubled.

• The strength of the magnetic field decreases.

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

• Increase the voltage of the battery.

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