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Materials and Components - Engineering

Q1:

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

ANS:A - the residual induction and coercive field should be large

Materials suitable for permanent magnet have large hysteresis loop. Hence residual and coercive field are large.