The equivalent capacitance of the combination shown in the figure is:

$A$ network of four capacitors with capacitances $C_1 = C$,$C_2 = 2C$,$C_3 = 3C$,and $C_4 = 4C$ is connected to a battery as shown in the figure. The ratio of the charges on $C_2$ and $C_4$ is

In the given circuit,a charge of $+80 \mu C$ is given to the upper plate of a $4 \mu F$ capacitor. At steady state,the charge on the upper plate of the $3 \mu F$ capacitor is (in $\mu C$)

Two capacitors, $C_1 = 2 \text{ mF}$ and $C_2 = 8 \text{ mF}$, are connected in series across a $300 \text{ V}$ source. Then:

Two capacitors $C_1 = 2 \ \mu F$ and $C_2 = 3 \ \mu F$ are connected in series between points $A$ and $C$. The potential at point $A$ is $40 \ V$ and the potential at point $C$ is $10 \ V$. Find the potential at point $B$ (between the two capacitors). (in $V$)

Capacitors with capacitances $C_1 = C$,$C_2 = 2C$,$C_3 = 3C$,and $C_4 = 4C$ are connected to a battery as shown in the figure. The ratio of charges on $C_2$ and $C_4$ is: