To demagnetise a magnet using the heating method. Which of the following is the correct step?(A) Heat the magnet to become red hot and allow it to cool in the east-west direction. (B) Heat the magnet to become red hot, and allow it to cool in the north-south direction(C) Heat the magnet in boiling water and allow it to cool in the north - south direction (D) Both A and B

To demagnetize a magnet using the heating method. 

We have to:

(A) Heat the magnet to become red hot and allow it to cool in the east-west direction.

This is because earths magnetic field is along North-South direction. If placed along north-south, there is a chance that the object can become magnetized again