What is the best method of demagnetizing a steel bar magnet?
A
Hammering
B
Heating it
C
Rough handling it
D
Solenoid method
Verified Correct Answer: D.
Physical Principles & Numerical Solution
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.
Source: Myschool Past Questions Archive (Record #26987)