Q 12-02-183JEE MainJEE Main 2019 (11 Jan, Shift 1)Easy
The given graph shows variation (with distance $r$ from centre) of:
Answer: (B) Potential of a uniformly charged spherical shell
The quantity is constant (and non-zero) for $r < r_0$ and falls off as $1/r$ outside.
For a charged spherical shell the potential inside equals the surface value $\dfrac{kQ}{r_0}$, and outside it is $\dfrac{kQ}{r}$. This matches.
The field of a shell is zero inside, and the field and potential of a solid sphere both vary inside, so the graph is the potential of a uniformly charged spherical shell.
Solution by Sreeraj P, M.Sc Physics