Question

Which of the following is not true about electromagnets?

• A. The polarity can be changed
• B. The magnetic property is due to current
• C. The strength cannot be changed
• D. Electromagnets are temporary magnets

Answer 1

The correct option is C

The strength cannot be changed

An electromagnet is a temporary magnet, made by passing current through a coil wound around a piece of soft iron. The strength of an electromagnet can be changed either by increasing the current or by increasing the number of coils wound around it. The polarity of the magnet can change by reversing the direction of current passing through it.