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JAMB Physics 2001 Question 25

Question 25

Capacitors

The diagram above shows three capacitors C1, C2 and C3 of capacitances 2 μF, 6 μF and 3 μF respectively. The potential differences across C1, C2 and C3 respectively are

Diagram for this question
  1. A.4 V, 6 V and 2 V
  2. B.2 V, 6 V and 4 V
  3. C.6 V, 4 V and 2 V
  4. D.6 V, 2 V and 4 V
Show the answer and explanation

Answer: D (6 V, 2 V and 4 V)

Explanation

In series: 1/C = ½ + ⅙ + ⅓ = 1, so C = 1 μF and Q = 1 × 12 = 12 μC. V = Q/C gives 12/2 = 6 V, 12/6 = 2 V and 12/3 = 4 V.