Find the potential difference $V_a -V_b$ between the points $a$ and $b$ shown in each part of the figure.
Diffcult
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Note: $V_{1,2,3,4}$ are the potential differences across $C_{1,2,3,4}$ and $Q_{1,2,3,4}$ are the final charges stored in $C_{1,2,3,4}$ respectively.
