JEE Main 2020 (2 Sep, Shift 2) Physics Q10: A charge Q is…

Question

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 are equal, the electric potential at the common centre is :

Accepted Answer

Option 4: $\frac{1}{4\pi\epsilon_0}\frac{(R + r)}{(R^2 + r^2)}Q$

Answer

$\frac{1}{4\pi\epsilon_0}\frac{(2R + r)}{(R^2 + r^2)}Q$

Answer

$\frac{1}{4\pi\epsilon_0}\frac{(R + r)}{2(R^2 + r^2)}Q$

Answer

$\frac{1}{4\pi\epsilon_0}\frac{(R + 2r)Q}{2(R^2 + r^2)}$

Answer

$\frac{1}{4\pi\epsilon_0}\frac{(R + r)}{(R^2 + r^2)}Q$

JEE Main 2 September 2020, Shift 2, Physics Q10

Same idea in other shifts