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

`2 A`

`4A`

`6A`

`8A`

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