Question

Mention 2 advantages of an electromagnet over a permanent magnet

Answer 1

The main advantage of anelectromagnet over a permanent magnet is that the magnetic field can be quickly changed by controlling the amount of electric current in the winding. However, unlike a permanent magnetthat needs no power, an electromagnetrequires a continuous supply of current to maintain the magnetic field.
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Answer 2

1. The magnetism of an electromagnet can be switched on or switched off as desired. This is not possible with permanent magnet.
2.An electromagnet can be made very strong
I) by increasing the number of turns in the coil, and
ll) by increasing the current passing through the coil.