08/07/2021

Compare Permanent Magnet & Electromagnet

  

Permanent magnet

Electromagnet

The strength of permanent magnet is fixed.

The strength of electromagnet can be varied by changing current through the coil.

Its polarities are fixed.

Its polarities can be changed by changing the direction of current through it.

They are made of alloys

It is nothing but copper coil wound on iron rod and connecting it to battery.

 

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