Four capacitors of $2, 6, 12$and $20\mathrm{\mu F}$ Are joined in parallel. Determine the equivalent capacitance. IF this arrangement is charged at a potential of $1000 \mathrm{V},$ Then determine the quantity of charge on it. What will be the charge on the $12\mathrm{\mu F}$ Capacitor? Energy in $20\mathrm{\mu F}$ Capacitor?

A potential difference of$120 \mathrm{V}$ Is applied to combination of two capacitors ${\mathrm{C}}_1 =4\mathrm{\mu F}$ and ${\mathrm{C}}_2=4\mathrm{\mu F}$ Connected in series. Calculate the effective capacitance of the combination.

A potential difference of $120 \mathrm{V}$ Is applied to combination of two capacitors ${\mathrm{C}}_1=4\mathrm{\mu F}$ and ${\mathrm{C}}_2=12\mathrm{\mu F}$ Connected in series. Calculate  

The potential difference and charge for each of these two capacitors.