Q.

The coercivity of a bar magnet is 120 A/m. It is to be demagnetised by placing it inside a solenoid of length 120 cm and number of tums 72. The current flowing through the solenoid is

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a

1A

b

0.5A

c

2A

d

3A

answer is C.

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Detailed Solution

See fig. . In figure OC, represents the coercivity.OC = H = ni where n is number of turns per unit length. Here,n=72120×100=60and H = 120A/m∴i=Hn=12060=2A
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