In the figure,three capacitors each of capacitance $6\,pF$ are connected in series. The total capacitance of the combination will be

Three parallel plate air capacitors are connected in parallel. Each capacitor has plate area $A/3$ and separation between the plates is $d$, $2d$, and $3d$ respectively. The equivalent capacity of the combination is ($\epsilon_0$ is the permittivity of free space).

For the arrangement of capacitors as shown in the circuit,the effective capacitance between the points $A$ and $B$ is (capacitance of each capacitor is $4 \mu F$): (in $\mu F$)

The equivalent capacitance between $A$ and $B$ is......$\mu F$.

In the given circuit,the potential difference across the $5 \mu F$ capacitor is: (in $V$)

What is the equivalent capacitance between $A$ and $B$ in the given figure (all values are in farad)?