Find the equivalent capacitance between $A$ and $B$. (in $C$)

The equivalent capacitance of the combination shown in the figure is:

$A$ network of four $10 \; \mu F$ capacitors is connected to a $500 \; V$ supply,as shown in the figure. Determine:
$(a)$ the equivalent capacitance of the network and
$(b)$ the charge on each capacitor.

Three capacitors $C_1$,$C_2$,and $C_3$ are connected in parallel,and their equivalent capacitance is $12$ units. Given $C_1 \cdot C_2 \cdot C_3 = 48$ units. When $C_1$ and $C_2$ are connected in parallel,their equivalent capacitance is $6$ units. Find the individual capacitances $C_1, C_2, C_3$.

Ten capacitors are joined in parallel and charged with a battery up to a potential $V$. They are then disconnected from the battery and joined again in series. The potential of this combination will be ....... $V$.

In the given circuit,the charge on the $4\, \mu F$ capacitor will be.....$\mu C$.