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JAMB Physics 1993 Question 41

Question 41

Capacitors

In the network shown above, determine the potential difference across the 5μF capacitor.

Diagram for this question
  1. A.3 V
  2. B.6 V
  3. C.12 V
  4. D.18 V
Show the answer and explanation

Answer: D (18 V)

Explanation

The 5 μF and 15 μF are in series across 24 V (the 20 μF is in parallel and does not affect them). Series C = 5 × 15/20 = 3.75 μF, Q = 3.75 × 24 = 90 μC, so V = 90/5 = 18 V.