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Q.

A bar magnet has a coercivity 4×10³ Am^–1. It is desired to demagnetize it by inserting it inside a solenoid 12 cm long and having 60 turns. The current that should be sent through the solenoid is

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a

2A

b

4A

c

6A

d

8A

answer is D.

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Detailed Solution

$B = μ_{0} H = \frac{μ_{0} Ni}{ℓ}; i = \frac{H ℓ}{N} = \frac{4 \times 10^{3} \times 12}{60 \times 100} = 8 A$

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A bar magnet has a coercivity 4×103 Am–1. It is desired to demagnetize it by inserting it inside a solenoid 12 cm long and having 60 turns. The current that should be sent through the solenoid is