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A bar magnet is demagnetized by inserting it inside a solenoid of length $0.2$ m, $100$ turns, and carrying a current of $5.2$ A. The coercivity of the bar magnet is:
(1) 285 A/m
(2) 2600 A/m
(3) 520 A/m
(4) 1200 A/m
$H = \frac{N}{l} \cdot i = \frac{100}{0.2} \times 5.2 = 2600$ A/m
BETA
