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Question

A magnet has coercivity of 3×103 Am1. It is kept in a 10cm long solenoid with a total of 50 turns. How much current has to be passed through the solenoid to demagnetize it?

Solution
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μH=μnI
Given:
where H=3×103Am1=coercivity
n=number of turns per unit length =500.1=500m1
To find: I= current
Now
H=nI
3×103Am1=500m1×I
I=6×106A=6μA

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