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The figure illustrate how B, the flux density inside a sample of unmagnetised ferromagnetic material varies with B0, the magnetic flux density in which the sample is kept. For the sample to be suitable for making a permanent magnet

(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