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Physics · 2026 · 1 mark
CBSE 2026 · Region 2 · Set 1 · Q2
Two metal spheres of radii r_1 and r_2(> r_1) having charges q_1 and q_2 respectively kept in air, are brought in contact. Which of the following…
Two metal spheres of radii $\displaystyle \mathrm{r}_{1}$ and $\displaystyle \mathrm{r}_{2}\left(>\mathrm{r}_{1}\right)$ having charges $\displaystyle \mathrm{q}_{1}$ and $\displaystyle \mathrm{q}_{2}$ respectively kept in air, are brought in contact. Which of the following statements is not correct ?
Official answer
(D)
The final potential of the system equals $\displaystyle \frac{1}{4 \pi \varepsilon_{0}} \frac{\left(\mathrm{q}_{1}+\mathrm{q}_{2}\right)\left(\mathrm{r}_{1}+\mathrm{r}_{2}\right)}{\mathrm{r}_{1} \mathrm{r}_{2}}$
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CBSE Class 12 Physics past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.