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# A magnet has coercivity of 3×103Am−1. 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?

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#### μ∘H=μ∘nIGiven:where H=3×10−3Am−1=coercivityn=number of turns per unit length =500.1=500m−1 To find: I= currentNowH=nI3×10−3Am−1=500m−1×II=6×10−6A=6μA

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