A bar magnet has a coercivity of 4×103Am−1. It is placed inside a solenoid of length 12cm having 60 turns in order to demagnetize it, the amount of current that should be passed through the solenoid is:
16A
8A
4A
2A
A
8A
B
2A
C
16A
D
4A
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Solution
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Given: H=4×103Am−1
L=12cm
N=60
Bar magnet requires a magnetic intensity (H=4×103Am−1) to become demagnetized.
Let n be the number of turns per unit length.
⇒n=NL=600.12=500turns/metre
Now, H=nI
⇒I=Hn=4×103500=8A
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