Find $C_{eq}$ of the following (Equivalent capacitance between).

(i)  (ii) 

(iii)  (iv) 

Area of each plate $=A.$ Find $C_{AB}$ (equivalent).

(i) Find equivalent capacitance between $A$ and $B.$
(ii) Find potential differences between $A_1$ and $B_1.$

Find work by battery after the switch is closed, if initial charge were zero on all the capacitors.

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 $AB$