Problem 3.124

Find the potential difference $\varphi_{A}-\varphi_{B}$ between points $A$ and $B$ of the circuit shown in Fig. $3.26 .$

\varphi_{A}-\varphi_{B}=\left(C_{2} \mathscr{E}_{2}-C_{1} \mathscr{E}_{1}\right) /\left(C_{1}+C_{2}+C_{3}\right)

Electric Capacitance, Energy of an Electric Field