Physics · 2015
JEE Main · 10 April 2015, Shift 1 · Q15
Shown in the figure are two point charges +Q and -Q inside the cavity of a spherical shell. The charges are kept near the surface of the cavity on…
Shown in the figure are two point charges +Q and -Q inside the cavity of a spherical shell. The charges are kept near the surface of the cavity on opposite sides of the centre of the shell. If $\displaystyle \sigma_1$ is the surface charge on the inner surface and $\displaystyle \mathrm{Q}_1$ net charge on it and $\displaystyle \sigma_2$ the surface charge on the outer surface and $\displaystyle \mathrm{Q}_2$ net charge on it then :
Official answer
(3)
$\displaystyle \begin{aligned}
& \sigma_1 \neq 0, Q_1=0 \\
& \sigma_2=0, Q_2=0
\end{aligned}$
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JEE Main 2015 Physics question, with the answer from NTA’s final answer key. Where our answers come from.