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The coercivity of a small magnet where t...

The coercivity of a small magnet where the ferromagnet gets demagnetized is `3 xx 10^(3) A m^(-1)` The current required to be passed in a solenoid of length 10 cm and number of turns 100, so that the magnet gets demagnetized when inside the solenoid, is

A

`9 mA`

B

30 mA

C

60 mA

D

3A

Text Solution

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The correct Answer is:
B
30 mA
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