$ \mathrm{r}_1=\sqrt{(\sqrt{3})^2+(\sqrt{3})^2}$
$ \mathrm{r}_2=\sqrt{(\sqrt{6})^2+0}$
As $r_1=r_2=\sqrt{6} \mathrm{~m}$
So potential difference $=0$

$(A)$ Charge on $B$ is zero
$(B)$ Potential at $B$ is zero
$(C)$ Charge is uniformly distributed on $A$
$(D)$ Charge is non uniformly distributed on $A$
