Five plates (same plate area for each) are placed as shown in figure. The separation between any two consecutive plates is $d.$ Then find $C_{AB}.$

Find charge on three capacitors.

In the given figure, potentials of points $A$ and $B$ are

Equivalent capacitance of given grouping across $AB$

Four capacitors are connected as given in figure, find $V_a-V_b.$

The equivalent capacitance between points $A$ and $B$ is

Initial charges on both the capacitors are $CV.$ Find change in potential energy of both if a battery is connected as shown. Also find the work done by battery.