Differentiate electromagnet and permanent magnet
S.N | Electromagnet | permanent magnet |
1 | Electromagnet is usually made of soft iron. | Permanent magnet is usually made of steel |
2 | Strength of an electromagnet can be varied | Strength of a permanent magnet is fixed. |
3 | Magnetism is temporary as long as the electric current remains passing to it. | Magnetism is permanent. |
4 | Poles of an electromagnet can be reversed by altering the direction of current. | Poles of a permanent magnet cannot be reversed. |