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JAMB Physics 2005 Question 19

Question 19

Capacitors

The figure above shows three capacitors, 2μF, 3μF and 6μF connected in series. If the p.d. across the system is 12V, the p.d. across the 6μF capacitor is

Diagram for this question
  1. A.4V.
  2. B.6V.
  3. C.12 V.
  4. D.2V.
Show the answer and explanation

Answer: D (2V.)

Explanation

1/C = 1/2 + 1/3 + 1/6 = 1, so C = 1 μF and Q = 12 μC. V across 6 μF = 12 μC ÷ 6 μF = 2 V.