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

Two capacitors are charged by a battery of $E$ volts as shown in the figure. What will be the ratio of the charges on these capacitors,$Q_1/Q_2$?

In the following circuit,the resultant capacitance between $A$ and $B$ is $1\,\mu F$. Then the value of $C$ is

In the circuit shown in the figure,the potential difference across the $4.5\,\mu F$ capacitor is.......$V$.

$A$ capacitor is made of a flat plate of area $A$ and the second plate has a staircase-like structure. The width of each stair is $a$ and its height is $b$. The total width of the plate is $2a$. The distance between the flat plate and the first part of the staircase is $d$. Find the capacity of the capacitor.

Eight capacitors,each of capacitance $C$,are connected as shown in the figure. The effective capacitance between $A$ and $B$ is