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

Find the equivalent capacitance across points $A$ and $B$.

In the circuit shown in the figure,four capacitors are connected to a battery. The equivalent capacitance of the circuit is......$ \mu F$

The equivalent capacitance between points $A$ and $B$ as shown in the figure is:

The combination of capacitors with $C_1 = 3\,\mu F$,$C_2 = 4\,\mu F$,and $C_3 = 2\,\mu F$ is charged by connecting $A$ and $B$ to a battery. Consider the following statements:
$I.$ Energy stored in $C_1$ $=$ Energy stored in $C_2$ $+$ Energy stored in $C_3$
$II.$ Charge on $C_1$ $=$ Charge on $C_2$ $+$ Charge on $C_3$
$III.$ Potential drop across $C_1$ $=$ Potential drop across $C_2$ $=$ Potential drop across $C_3$
Which of these is/are correct?

In the circuit shown,a potential difference of $60\,V$ is applied across $AB$. The potential difference between the points $M$ and $N$ is.....$V$.