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  4. 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 coercivitv of the bar magnet is :

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Q. 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 coercivitv of the bar magnet is :

JEE MainJEE Main 2019Magnetism and Matter

Solution:

Coercivity = $H = \frac{B}{\mu_{0}} $
$ =ni = \frac{N}{\ell}i = \frac{100}{0.2} \times5.2 $
= $2600 \,A/m$