Physics - Elecrostatics Question with Solution | TestHub

Let a total charge$2\mathrm{Q}$be distributed in a sphere of radius$\mathrm{R},$with the charge density given by$\rho \left(\mathrm{r}\right)=\mathrm{k}\mathrm{r},$where$\mathrm{r}$is the distance from the centre. Two charges$\mathrm{A}$and$\mathrm{B}$, of$-\mathrm{Q}$each, are placed on diametrically opposite points, at equal distance, a, from the centre. If$\mathrm{A}$and$\mathrm{B}$do not experience any force, then: