JEE Mains · Physics · STD 12 - 2. Electric potential and capacitance
The electrostatic potential on the surface of uniformly charged spherical shell of radius \(\mathrm{R}=10 \mathrm{~cm}\) is 120 V. The potential at the centre of shell, at a distance \(\mathrm{r}=5 \mathrm{~cm}\) from centre, and at a distance \(\mathrm{r}=15 \mathrm{~cm}\) from the centre of the shell respectively, are :
- A \(120 \mathrm{~V}, 120 \mathrm{~V}, 80 \mathrm{~V}\)
- B \(40 \mathrm{~V}, 40 \mathrm{~V}, 80 \mathrm{~V}\)
- C \(0 \mathrm{~V}, 0 \mathrm{~V}, 80 \mathrm{~V}\)
- D \(0 \mathrm{~V}, 120 \mathrm{~V}, 40 \mathrm{~V}\)
Answer & Solution
Correct Answer
(A) \(120 \mathrm{~V}, 120 \mathrm{~V}, 80 \mathrm{~V}\)
Step-by-step Solution
Detailed explanation
Potential inside shell is equal to potential on surface \(\mathrm{V}_{\mathrm{in}}=\mathrm{V}_{\text {surface }}=\frac{\mathrm{kQ}}{\mathrm{R}}=120 \mathrm{~V}\) at \(\mathrm{r}=15 \mathrm{~cm}\)…
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