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Question

A bar magnet has coercivity 4×103Am1. It is placed in a solenoid having 40 turns per cm and is 1.2m long. The current carried by the solenoid to demagnetize the bar magnet is :
  1. 6A
  2. 8A
  3. 5.78A
  4. none of these

A
none of these
B
8A
C
5.78A
D
6A
Solution
Verified by Toppr

H=4103A/m
B=Hl=4103A/m1.2=48102A
μ0=4π107Tm/a
48102=μoNI=4π10740I
I=481024π10740=0.095109A

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