Question

Point out three differences between an electromagnet and a bar (or permanent) magnet.

Answer 1

Electromagnet	Bar Magnet
1. An electromagnet exhibits a much stronger magnetic field.	A bar magnet is not able to exhibit a strong magnetic field.
2. Its polarity can be reversed by reversing the direction of current flowing in the turns of the coil (or solenoid).	Its polarity is fixed.
3. It is a temporary magnet, it behaves as a magnet only when the current flows through the solenoid.	It is a permanent magnet and cannot be readily demagnetized.