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JAMB Physics 2010 Question 34

Question 34

Capacitors

Three capacitors of capacitance, 2μF, 4μF and 8μF are connected in parallel and a p.d of 6 V is maintained across each capacitor, the total energy stored is

  1. A.6.90 × 10−5 J.
  2. B.6.90 × 10−4 J.
  3. C.2.52 × 10−4 J.
  4. D.2.52 × 10−6 J.
Show the answer and explanation

Answer: C (2.52 × 10−4 J.)

Explanation

In parallel C = 2 + 4 + 8 = 14 μF. Energy = ½CV2 = ½ × 14 × 10−6 × 62 = 2.52 × 10−4 J.