Physics · 2021
JEE Main · 3 August 2021, Shift 2 · Q14
Two concentric and coplanar circular coils have radius a and b(≫ a) as shown in figure. Resistance of the inner coil is R. Current in the outer coil…
Two concentric and coplanar circular coils have radius $\displaystyle a$ and $\displaystyle b(\gg a)$ as shown in figure. Resistance of the inner coil is $\displaystyle R$. Current in the outer coil is increased from $\displaystyle 0$ to $\displaystyle i$, then total charge circulating the inner coil is
Official answer
(4)
$\displaystyle \frac{\mu_0 i \pi a^2}{2 R b}$
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JEE Main 2021 Physics question, with the answer from NTA’s final answer key. Where our answers come from.