Three capacitors $2\,\mu F$,$3\,\mu F$,and $6\,\mu F$ are joined in series with each other. What is the minimum effective capacitance in $\mu F$?

In the circuit shown in the figure,$C = 6\,\mu F$. The charge stored in the capacitor of capacity $C$ is......$\mu C$.

In the given circuit,what is the electric potential at point $C$ in $volts$?

Four equal capacitors,each of capacity $C$,are arranged as shown. The effective capacitance between $A$ and $B$ is

Four metallic plates, each with a surface area of one side $A$, are placed at a distance $d$ from each other. The plates are connected as shown in the figure. The capacitance of the system between $a$ and $b$ is

Three identical capacitors of capacitance $C$ each are connected in series and this connection is connected in parallel with one more such identical capacitor. The equivalent capacitance of the whole combination is: