The capacitors of capacity $C_1$ and $C_2$ are connected in parallel,then the equivalent capacitance is:

The total charge on the system of capacitors with capacitances $C_{1} = 1\,\mu F$,$C_{2} = 2\,\mu F$,$C_{3} = 4\,\mu F$,and $C_{4} = 3\,\mu F$ connected in parallel is $......\,\mu C$. (Assume a battery of $20\,V$ is connected to the combination.)

Two parallel plate air capacitors are connected in parallel. Each capacitor has plate area $A/2$ and separation between the plates is $d$ and $2d$ respectively. The equivalent capacity of the combination is $(\epsilon_0 = \text{absolute permittivity of free space})$

If the equivalent capacitance between points $A$ and $B$ of the combination of capacitors shown in the figure is $6C$, then the capacitor $C^1$ is: (in $C$)

Three capacitors each of capacity $4\,\mu F$ are to be connected in such a way that the effective capacitance is $6\,\mu F$. This can be done by:

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