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(B) In the given hysteresis loop,$OQ$ represents the retentivity (or remanence) of the material,which is the residual magnetic flux density when the e

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$OQ$ and $OR$ should both be large

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(B) In the given hysteresis loop,$OQ$ represents the retentivity (or remanence) of the material,which is the residual magnetic flux density when the external magnetic field is reduced to zero.$OR$ represents the coercivity,which is the intensity of the external magnetic field required to reduce the residual magnetism to zero.For a material to be suitable for making a permanent magnet,it must have high retentivity so that it remains strongly magnetized,and high coercivity so that it is not easily demagnetized by external magnetic fields,temperature fluctuations,or mechanical shocks.Therefore,both $OQ$ and $OR$ should be large.

The figure illustrates 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 sample to be suitable for making a permanent magnet:

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