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A bar magnet is demagnetized by insertin...

A bar magnet is demagnetized by inserting it inside a solenoid of length 0.2 m, 100 turns, and carrying a current of 5.2 A. The coercivity of the bar magnet is :

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corecivity, `H=B/(mu_(0))` and `B=mu_(0) "ni" (n=N/l)`
or `H=N/li=100/0.2xx5.2=2600A//m`
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