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JAMB Physics 1992 Question 41

Question 41

Capacitors

A capacitor of 10μF is connected across a cell of 12 volts as shown above. Calculate the energy stored in the capacitor.

Diagram for this question
  1. A.7.2 × 10−4 J
  2. B.1.4 × 10−3 J
  3. C.1.4 × 10−4 J
  4. D.1.2 × 10−2 J
Show the answer and explanation

Answer: A (7.2 × 10−4 J)

Explanation

E = ½CV2 = ½ × 10 × 10−6 × 122 = 7.2 × 10−4 J.