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# The coercivity of a magnet is 3×103Am−1. What current should be passed through a solenoid of length 10 cm and number of turns 50 that the magnet is demagnetized when inserted in it?3A6A9A12A

A
3A
B
6A
C
9A
D
12A
Solution
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#### The correct option is B6ALength of solenoid L=10 cm=0.1 mNumber of turns N=50So, number of turns per unit length n=NL=500.1=500Current to be passed i=Hn⟹ i=3×103500=6 A

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