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JAMB Physics 1994 Question 43

Question 43

Capacitors

A capacitor 8μF, is charged to a potential difference of 100V. The energy stored by the capacitor is

  1. A.1.0 × 104 J
  2. B.8.0 × 10 J
  3. C.1.25 × 10 J
  4. D.4.0 × 10−2 J
Show the answer and explanation

Answer: D (4.0 × 10−2 J)

Explanation

E = ½CV2 = ½ × 8 × 10−6 × 1002 = 4.0 × 10−2 J.