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Discussion

For a permanent magnetic material

  • A.the residual induction and coercive field should be large
  • B.the residual induction and coercive field should be small
  • C.area of hysteresis loop should be small
  • D.initial relative permeability should be high

Answer: A

Materials suitable for permanent magnet have large hysteresis loop.

Hence residual and coercive field are large.

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