Question

Which of the following statements about an electromagnet is NOT true?

• A. It is a permanent magnet.
• B. It works only in the presence of electricity.
• C. Insulated wire is wound around it.
• D. It is used in fans and radio.

Answer 1

The correct option is A

It is a permanent magnet.

An electromagnet is made by winding an insulated wire around a magnet. It works as a standard magnet only when an electric current is passed through it ( by generating magnetic fields). When the electric current is removed, the magnetic field exhausts. Thus an electromagnet is a temporary magnet and not a permanent magnet.