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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

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OQ should be large, OR should be small

OQ and OR should both be large

OQ and OR should both be small

OQ should be small and OR should be large

answer is B.

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Detailed Solution

For permanent magnet
Retentivity OQ - high
Coercivity OR – high

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