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Physics · 2014
JEE Main 2014 · 2014-04-06 Offline · Q20
The coercivity of a small magnet where the ferromagnet gets demagnetized is 3 × 10^3 A m^-1. The current required to be passed in a solenoid of…
The coercivity of a small magnet where the ferromagnet gets demagnetized is $\displaystyle 3 \times 10^3 \mathrm{~A} \mathrm{~m}^{-1}$. The current required to be passed in a solenoid of length $\displaystyle 10$ cm and number of turns $\displaystyle 100$, so that the magnet gets demagnetized when inside the solenoid, is :
Official answer
(3)
$\displaystyle 3$ A
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JEE Main 2014 Physics question, with the answer from NTA’s final answer key. Where our answers come from.