Question

What force is used for residual magnetism to be zero is called?

Answer 1

Hello mate here is your answer.

This is called the point of coercivity on the curve. (The reversed magnetizing force has flipped enough of the domains so that the net flux within the material is zero.) The forcerequired to remove the residual magnetism from the material iscalled the coercive force or coercivity of the material.

Hope it helps you.