Physics - Capacitor Question with Solution | TestHub

Let potential of $A$ is zero and that of $B$ is $V$. Applying charge conservation on given circuit. $\begin{array}{rl}& 1(V-10)+2(V-0)+5(V-10)=0\\ & 8V-60=0\\ & V=\frac{60}{8}=7.5\text{ volt }\end{array}$ So charge on $2\mu \mathrm{F}=2\times 7.5=15\mu \mathrm{C}$