The coercivity of a magnet is 3×103Am−1. What current should be passed through a solenoid of length 10cm and number of turns 50 that the magnet is demagnetized when inserted in it?
3A
6A
9A
12A
A
9A
B
3A
C
6A
D
12A
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Solution
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The correct option is B6A Length of solenoid L=10cm=0.1m Number of turns N=50 So, number of turns per unit length n=NL=500.1=500 Current to be passed i=Hn ⟹i=3×103500=6A
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