Q1: What is hysteresis?

A lag between cause and effect

B lead between voltage and current

C lead between cause and effect

D lag between voltage and current

ANS:B - lag between cause and effect

Hysteresis is graph b/w magnetizing current (x-axis) and magnetism (on y-axis) whenever current changes it produces magnetic field. In transformer for example current changes in primary coil (which is cause) and as a result magnetic field is induced in iron core and in secondary coil (which is effect) so magnetism lags behind magnetizing current.

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