Question

state one advantage of electromagnet over permanent magnet​

Answer 1

Answer:

The main advantage of an electromagnet 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 magnet that needs no power, an electromagnet requires a continuous supply of current to maintain the magnetic field.

Answer 2

Answer:

the polarity of the electro magnet can be reversed