Physics · 2026
JEE Main · 24 January 2026, Shift 1 · Q38
There are three co-centric conducting spherical shells A, B and C of radii a, b and c respectively (c>b>a) and they are charged with charge q_1, q_2…
There are three co-centric conducting spherical shells $\displaystyle A, B$ and $\displaystyle C$ of radii $\displaystyle a, b$ and $\displaystyle c$ respectively $\displaystyle (c>b>a)$ and they are charged with charge $\displaystyle q_1, q_2$ and $\displaystyle q_3$ respectively. The potentials of the spheres $\displaystyle A, B$ and $\displaystyle C$ respectively, are :
Official answer
From NTA’s final answer key for this paper.
(2)
$\displaystyle \frac{1}{4 \pi \epsilon_{\mathrm{o}}}\left(\frac{q_1}{a}+\frac{q_2}{b}+\frac{q_3}{c}\right), \frac{1}{4 \pi \epsilon_{\mathrm{o}}}\left(\frac{q_1+q_2}{b}+\frac{q_3}{c}\right), \frac{1}{4 \pi \epsilon_{\mathrm{o}}}\left(\frac{q_1+q_2+q_3}{c}\right)$
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JEE Main 2026 Physics question, with the answer from NTA’s final answer key. Where our answers come from.