ELECTROMAGNETIC FORCES

How does an electromagnet work?

• Electric circuit creates a magnetic field around the core

• Electricity flows through the core to make it magnetized

An electromagnet is...

• Metal that becomes a permanent magnet with electricity

• Metal that becomes a temporary magnet with electricity

When two magnets interact...

• like poles attract

• opposite poles repel

• nothing happens

• opposite poles attract

Can magnetism go through objects?

• yes

• no

What happens when two north poles of a magnet are placed together?

• they repel
• they attract
• they cancel each other out
• the strength of the magnet is doubled

The area of magnetic force around a magnet is known as its _____________.

• magnetic field

• magnetic declination

• magnetic fan lines

• magnetic tan lines

The SI unit of magnetic field is 

• weber
• guass
• tesla
• farad

The picture is an example of an:

• Electric circuit
• Electromagnet
• Electric nail
• Electric power cell

If a current is running through a straight wire, the magnetic field...

• has a circular shape

• moves the opposite direction of the current

• has a square shape

• has a straight shape

What energy transformation takes place in an electric fan's motor?

• electrical energy into mechanical energy

• mechanical energy into electrical energy

• alternating current to direct current

• direct current to alternating current