A bar magnet has a coercivity of 4×10³ Am⁻¹. It is placed inside a solenoid of length 12 cm having 60 turns in order to demagnetise it. The amount of current that should be passed through the solenoid is

Options

(a) 16A
(b) 8A
(c) 4A
(d) 2A

Correct Answer:

8A

Explanation:

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