Question

What advantage does an electromagnet have over a permanent magnet?

• A. An electromagnet can be used for picking up more metals.
• B. An electromagnet can be switched off.
• C. An electromagnet is lighter.
• D. All of these

Answer 1

The correct option is B An electromagnet can be switched off.

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.An electromagnet can be switched off.