What is the best method of demagnetizing a steel bar magnet?
- Hammering
- Heating it
- Rough handling it
-
Solenoid method
The correct answer is: D
Explanation
Solenoid method: This involves placing the magnet inside a solenoid (an electromagnet) and gradually reducing the current. It provides a controlled environment for effective demagnetization.
There is an explanation video available .