The two graphs drawn here, show the variation of electrostatic potential $\left(V\right)$ with $\frac{1}{r}$($r$ being distance of the field point charge) for two point charges $q_1$ and $q_2$. What are the signs of the two charges?

The two graphs drawn here, show the variation of electrostatic potential $\left(V\right)$ with $\frac{1}{r}$($r$ being distance of the field point charge) for two point charges $q_1$ and $q_2$. Which of the two charges has a larger magnitude and why?

The following data was obtained for the dependence of the magnitude of electric field, with distance, from a reference point $O$, within the charge distribution in the shaded region.

Identify the charge distribution and justify your answer.

The following data was obtained for the dependence of the magnitude of electric field, with distance, from a reference point $O$, within the charge distribution in the shaded region.

If the potential due to this charge distribution, has a value $V$ at the point $A$, what is its value at the point $A\text{'}$?

Three concentric metallic shells $A, B$ and $C$ of radii, $a, b$ and $c\left(a<b<c\right)$ have surface charged densities $+\sigma , -\sigma$ and $+\sigma$ respectively, as shown in figure below. Find potential of three shells $A, B, C$.