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JAMB Physics 2002 Question 30

Question 30

Capacitors

The energy stored in a capacitor of capacitance 10μF carrying a charge of 100μC is

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

Answer: B (5 × 10−4J)

Explanation

E = Q2/(2C) = (100 × 10−6)2 ÷ (2 × 10 × 10−6) = 5 × 10−4 J.