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Capacitor Questions

Q4. A charged capacitor of capacitance 50 mF is connected across the terminals of a voltmeter of resistance 200 kΩ . When time t = 0, the reading on the voltmeter is 20.0 V.

Calculate

(a) the charge on the capacitor at t = 0,

(1 mark)

(b) the reading on the voltmeter at t = 20s,

(2 marks)

(c) the time which must elapse, from t = 0, before 75% of the energy which was stored in the capacitor at t = 0 has been dissipated.

(3 marks)

(Total 6 marks)