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The coercitivity of a small magnet where...

The coercitivity of a small magnet where the ferromagnet gets demagnetized is `3 xx 10^(3) Am^(-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

`30mA`

B

`60mA`

C

`3A`

D

`6A`

Text Solution

Verified by Experts

The correct Answer is:
C
For solenoid, `b=MU_(0)nI`
`mu_(0)H=mu_(0)nI`
`mu=nI`
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