26. Capacitors & Dielectrics

A circuit contains three capacitors: $C=2\mu F$ and $C=4\mu F$ are connected in series, and this combination is connected in parallel with a $C=6\mu F$ capacitor. What is the equivalent capacitance of the entire combination?

A $4.0\mu F$ capacitor is connected to a $12V$ battery. What is the charge stored on the capacitor?

In a circuit with a battery of emf $V$ and a capacitor of capacitance $C$ connected in series with a resistor, in the steady state, what is the charge $q$ on the capacitor?

A parallel plate capacitor has circular plates of radius $R$ separated by a distance $d$. If the space between the plates is filled with vacuum, what is the capacitance of the capacitor?