Capacitance questions

A capacitor gains 300 μC of negative charge on one of its plates. How much charge does it store?

300 μC

A 200 nF capacitor is charged by connecting it across a p.d of 6V. How much charge does it store?

Q = CV = 200x10^-9 × 6.0 C = 1.2 μC

A 200 nF capacitor is charged by connecting it across a p.d of 6.0 V. It is disconnected. How much total charge remains on the capacitor?

• Charge remains

• 1.2 μC

A 200 nF capacitor is charged by connecting it across a p.d of 6.0 V. It is disconnected and then reconnected across 9.0 V. How much total charge remains on the capacitor?

Q=CV=200x10^-9 × 9.0 = 1.8 μC

A capacitor is charged such that there is a charge of +20 mC on the positive plate. What is the charge on the negative plate?

• - 20 mC

• Equal and opposite charge