Physics · 2020
JEE Main · 2 September 2020, Shift 2 · Q10
A charge Q is distributed over two concentric conducting thin spherical shells radii r and R(R>r). If the surface charge densities on the two shells…
A charge Q is distributed over two concentric conducting thin spherical shells radii $\displaystyle r$ and $\displaystyle R(R>r)$. If the surface charge densities on the two shells are equal, the electric potential at the common centre is :
Official answer
(4)
$\displaystyle \frac{1}{4 \pi \epsilon_0} \frac{(R+r)}{\left(R^2+r^2\right)} Q$
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JEE Main 2020 Physics question, with the answer from NTA’s final answer key. Where our answers come from.