The $B$-$H$ curve for a ferromagnet is shown in the figure. The ferromagnet is placed inside a long solended with $1000$ turns/cm. The current that should be passed in the solended to demagnetise the ferromagnet completely is : - DASH

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Question

The $B$-$H$ curve for a ferromagnet is shown in the figure. The ferromagnet is placed inside a long solended with $1000$ turns/cm. The current that should be passed in the solended to demagnetise the ferromagnet completely is :

$1$ $mA$

$2$ $mA$

$20\,\mu A$

$40\,\mu A$

Solution

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