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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

285 A/m

B

520 A/m

C

1200 A/m

D

2600 A/m

Text Solution

Verified by Experts

The correct Answer is:
D
`B = mu_(0)H`
`mu_(0)ni =mu_(0) xx H`
`100/(0.2) xx 5.2 = H rArr H = 2600 `A/m .
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