Question

Which method does not demagnetise a bar magnet? A Heat the bar magnet and place it in the east-west direction to cool. B Place the bar magnet in the east-west direction and hammer it. C Place the bar magnet in a coil connected to an a.c. supply and slowly withdraw it. o Place the bar magnet in a coil connected to a dc. supply and slowly withdraw it.

Answer 1

C

Step-by-step explanation:

( I dun know how to explain it ‍ but i do know that the answer is C. Saw it in a past paper.)