Two equal capacitors are first connected in series and then in parallel. The ratio of the equivalent capacities in the two cases will be

Three capacitors of capacity $C_1, C_2, C_3$ are connected in series. Their total capacity will be

$A$ network of four $10 \; \mu F$ capacitors is connected to a $500 \; V$ supply,as shown in the figure. Determine:
$(a)$ the equivalent capacitance of the network and
$(b)$ the charge on each capacitor.

Eight capacitors each of capacity $2 \mu F$ are arranged as shown in the figure. The effective capacitance between $A$ and $B$ is (in $\mu F$)

The equivalent capacitance between points $A$ and $B$ of the circuit shown will be

The diagram shows three capacitors with their capacitances and their respective breakdown voltages. What should be the maximum value of the external $emf$ $(E)$ of the source such that no capacitor breaks down?