Electromagnets

• Physics
• Secondary Education

Electromagnet

An electromagnet is a temporary magnet whereas bar magnet is a permanent magnet

Polarity of bar magnet can be reversed

We can reverse the polarity of an electromagnet

Which of the following actions will decrease the strength of the magnetic field of an electromagnet?

1. Using fewer loops of wire per meter in the coil
2. Decreasing the current in the wire
3. Removing the iron core
4. All of the above

What THREE ways are electromagnets different from permanent magnets?

1. They can be turned ON and OFF
2. they are smaller in size
3. they can increase in strength by increasing the current in the wire
4. they can change which is the north and south pole