Electric field at the surface, of a conducting shell of radius 'r' is measured as X.
Electric field at a distance 3r from the centre of the shell is:
Answer & explanation
Correct answer: option 3
We know, \( E \propto \frac{1}{r^2}\) (for a shell)
∴ \( \frac{E_1}{E_2}=\frac{r_2^2}{r_1^2} \)
\( \frac{X}{E_2}=\frac{(3 r)^2}{(r)^2} \)
∴ \( E_2=\frac{X}{9} \)