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Q.

A bar magnet has a Coercivity 4×103 Am-1. It is desired to demagnetize it by inserting it inside a solenoid 12cm long and having 50 turns. The current that should be sent through the solenoid is

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a

2A

b

4A

c

6A

d

9.6A

answer is D.

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Detailed Solution

Inside solenoid, magnetizing field =H=NiL     ∴ i=HLNTo demagnetize the bar magnet, this H should be equal to coercivity. ⇒i=4×103×0.1250= 9.6 A
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