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The B-H curve for a ferromagnet is shown...

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

A

2 mA

B

`20 mu A`

C

`1 mA`

D

`40 mu A`

Text Solution

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The correct Answer is:
C
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