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JAMB Physics 2001 Question 23

Question 23

Capacitors

The diagram above shows two capacitors P and Q of capacitances 2 μF and 4 μF respectively connected to a d.c. source. The ratio of energy stored in P to Q is

Diagram for this question
  1. A.4 : 1
  2. B.2 : 1
  3. C.1 : 4
  4. D.1 : 2
Show the answer and explanation

Answer: D (1 : 2)

Explanation

P and Q are in parallel, so they have the same voltage. Energy = ½CV2 is proportional to C, so the ratio is 2 : 4 = 1 : 2.