Optimal Hysteresis Loop Shapes for Permanent Magnets and Transformer Cores

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KingBigness
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Homework Statement


What hysteresis loop shape would you require for a magnetic material to be used in

A) a permanent magnet
B) transformer core

The Attempt at a Solution



No idea what this means...but it is for my lab tomorrow so I probably should.

Any help would be greatly appreciated,
 
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Discussion

Think of a B-H hysteresis loop and how B does not return to zero when H does (remebering that H is prportional to applied current). Would that work to make a permanent magnet?

Then recall that the area under the B-H curve represents energy lost. Would that be a good material for a transformer core?

cf. wikipedia/wiki/magnetic_core.com