CBSE 2026 · Region 2 · Set 1 · Q2 · 1 mark
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
From CBSE’s own marking scheme for this paper.
(D)
The final potential of the system equals $\displaystyle \frac{1}{4 \pi \varepsilon_{0}} \frac{\left(\mathrm{q}_{1}+\mathrm{q}_{2}\right)\left(\mathrm{r}_{1}+\mathrm{r}_{2}\right)}{\mathrm{r}_{1} \mathrm{r}_{2}}$
Electrostatic Potential and CapacitanceElectrostatics of ConductorsUnderstandmcqmedium
Practice Electrostatic Potential and Capacitance →All Electrostatic Potential and Capacitance questions
More from Electrostatic Potential and Capacitance
- (i) A parallel plate capacitor with plate area A and plate separation d has a capacitance C 0. A slab of…2025 · asked 3×
- (i) In the figure, OA and OB show the variation of electric potential V at a point due to two point charges Q…2026 · asked 3×
- (i) Explain the following statements giving reason: (I) An equipotential surface through a point is normal to…2026 · asked 3×
- A parallel plate capacitor has two parallel plates which are separated by an insulating medium like air,…2025 · asked 3×
- (i) Derive an expression for potential energy of an electric dipole p in an external uniform electric field…2024 · asked 3×
- Dielectrics play an important role in design of capacitors. The molecules of a dielectric may be polar or…2024 · asked 3×
- The figure shows four pairs of parallel identical conducting plates, separated by the same distance 2.0 cm…2024 · asked 3×
- A capacitor is a system of two conductors separated by an insulator. The two conductors have equal and…2023 · asked 3×
CBSE Class 12 Physics past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.