Differences between bar magnet and electric magnet

Here are the key differences between a bar magnet and an electromagnet:

• Source of Magnetism: A bar magnet has permanent magnetism due to the alignment of its internal atomic magnetic domains. An electromagnet produces magnetism when an electric current flows through a coil of wire, typically wrapped around a ferromagnetic core.

• Control: The magnetic field of a bar magnet is always present and cannot be turned on or off. The magnetic field of an electromagnet can be easily controlled by switching the electric current on or off.

• Strength: The strength of a bar magnet is fixed. The strength of an electromagnet can be varied by changing the amount of current flowing through the coil or the number of turns in the coil.

• Polarity: The poles (North and South) of a bar magnet are fixed. The polarity of an electromagnet can be reversed by reversing the direction of the electric current.