Question

Which of the following is/are true with respect to electromagnets?

• A. The magnetic properties are permanent.
• B. Magnetic properties remain as long as the current flows.
• C. It does not have poles.
• D. Its magnetic strength is fixed.

Answer 1

The correct option is B

Magnetic properties remain as long as the current flows.

The magnetic properties of an electromagnet are due to the flow of current. Hence, they do not have permanent magnetic properties but they do have poles.

The electromagnet behaves like a magnet as long as the current is passed through it. Its magnetic strength can be changed by increasing or decreasing the current or changing the core. Poles of an electromagnet can be changed by reversing the direction of the current.