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A bar magnet has coercivity 4xx10^(3) Am...

A bar magnet has coercivity `4xx10^(3) Am^(-1)`. It is desired to demagnetise it by inserting it inside a solenoid `12 cm` long and having `60` turns. The current that should be sent through the solenoid is

1. 8 A
2. 6 A
3. 4.5 A
4. A

A

`2 A`

B

`4A`

C

`6A`

D

`8A`

Text Solution

Verified by Experts

The correct Answer is:
D
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