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A bar magnet is demagnetized by insertin...

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

A

1200 frac(A)(m)

B

1285 frac(A)(m)

C

2600frac(A)(m)

D

5200 frac(A)(m)

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