A bar magnet has a coercivity of (4000 A...

A bar magnet has a coercivity of `(4000 Am^-1)` It is desired to demagnetize by inserting it inside a solenoid 10 cm long and having 500 turns. The current which should be carried by solenoid is Consider ideal solenoid)

`0.8 mu_0A`

`0.4 mu_0A`

`0.8 A`

`(0.8/MU_3) A`

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