Physics · 2019
JEE Main · 9 January 2019, Shift 1 · Q21
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…
A bar magnet is demagnetized by inserting it inside a solenoid of length $\displaystyle 0.2$ m, $\displaystyle 100$ turns, and carrying a current of $\displaystyle 5.2$ A. The coercivity of the bar magnet is :
Official answer
(4)
$\displaystyle 2600$ A/m
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JEE Main 2019 Physics question, with the answer from NTA’s final answer key. Where our answers come from.