Two capacitors,each having a capacitance of $2 \mu F$,are connected in series. What will be the effective capacitance of these capacitors (in $\mu F$)?

In the given figure,the total charge stored in the combination of capacitors is $100\,\mu C$. The value of '$x$' is $............$.

Three capacitors of capacitances $2 \;pF$,$3 \;pF$,and $4 \;pF$ are connected in parallel.
$(a)$ What is the total capacitance of the combination?
$(b)$ Determine the charge on each capacitor if the combination is connected to a $100 \;V$ supply.

Four identical condensers are connected in parallel and then in series. The ratio of equivalent capacitance in series to that in parallel combination is

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

$A$ capacitance of $2\ \mu F$ is required in an electrical circuit across a potential difference of $1.0\ kV$. $A$ large number of $1\ \mu F$ capacitors are available which can withstand a potential difference of not more than $300\ V$. The minimum number of capacitors required to achieve this is