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If you are given a hysteresis graph of t...

If you are given a hysteresis graph of two materials drawn in the same scale, then how will you decide that which one is going to produce more heat, when subjected to a variable magnetic field?

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An area enclosed within the hysteresis loop is an indicator of heat produced, which is proportional to the loop area. Hence, a material with thicker hysteresis loop will yield more heat when it is repeatedly magnetised and demagnetised.
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