Suggest a material that can be used to make a permanent magnet.

Options

A. low retentivity and low coercive force
B. low retentivity and high coercive force
C. high retentivity and low coercive force
D. high retentivity and high coercive force

Answer

D

Explanation

High retentivity is obvious because we want material to retain magnetism after magnetization, But to retain the magnetism for longer duration we need high coercive force.