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Question

The coercivity of a magnet is 3×103Am1. 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?
  1. 3A
  2. 6A
  3. 9A
  4. 12A

A
9A
B
3A
C
6A
D
12A
Solution
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The correct option is B 6A
Length of solenoid L=10 cm=0.1 m
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=6 A

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