The material used for permanent magnet has

Options

A. low retentivity, high coercivity
B. high retentivity, low coercivity
C. high retentivity, high coercivity
D. low retentivity, low coercivity

Answer

C

Explanation

The material for a permanent magnet should have high retentivity so that the magnet is strong, and high coercivity so that the magnetisation is not wiped out by stray external fields, mechanical illtreatment and temperature changes.