Question

Which of the following statements is incorrect regarding an electromagnet?

• A. Their magnetic strength can be altered.
• B. They are permanent in nature.
• C. They have both North and South Poles.
• D. They can be turned on and off.

Answer 1

The correct option is B They are permanent in nature.

Electromagnets are the temporary magnets which show magnetic nature when current flows through them. So, their magnetic field can be switched on and off by turning the current on and off. Also, their magnetic field can be varied by changing the amount of current. Their magnetic field lines resembles that of a bar magnet and they also have north and south poles.