First slide
Magnetic properties of materials
Question

A bar magnet has a Coercivity 4×103 Am-1. It is desired to demagnetize it by inserting it inside a solenoid 12cm long and having 50 turns. The current that should be sent through the solenoid is

Moderate
Solution

Inside solenoid, magnetizing field =H=NiL

    i=HLN

To demagnetize the bar magnet, this H should be equal to coercivity. i=4×103×0.1250= 9.6 A

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