Question

What is coercivity force in magnetic materials?

(a) The force required to add upon the existing magnetization

(b) The force required to remove the existing magnetization

(c) The force required to produce magnetic flux

(d) The force required to break magnetic flux

This question was addressed to me in an interview for internship.

This is a very interesting question from Magnetic Materials in division Electrical Engineering Materials of Design of Electrical Machines

Answer 1

Right answer is (b) The force required to remove the existing magnetization

To explain I would say: Magnetic materials generally have the property of retaining magnetization, even if the external magnetic field is removed. So, coercive force is the force that is required to reduce the magnetization.