The figure illustrate how B, the flux density inside a sample of unmagnetised ferromagnetic material varies with `B_(0)`, the magnetic flux density in which the sample is kept. For the samle to be suitable for making a permanent magnet

Options

A. OQ should be large, OR should be small
B. OQ and OR should both be large
C. OQ should be small and OR should be large
D. OQ and OR should both be small

Answer

B

Explanation

In the given figure OQ refers to retentivity while OR refers to coercivity. For permanents both retentivity and coercivity should be high.