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A bar magnet is demagnetized by insertin...

A bar magnet is demagnetized by inserting it inside a solenoid of length 0.2 m, 100 turns, and carrying a current of 5.2 A. The coercivity of the bar magnet is :

A

`285A//m`

B

`2600A//m`

C

`520A//m`

D

`1200A//m`

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