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Calculate the energy stored in 20μF capacitor if the potential difference between the plates is...

Physics
WAEC 1992
Calculate the energy stored in 20μF capacitor if the potential difference between the plates is 40 V.
  • A. 3.2 x10-2J
  • B. 1.6x102J
  • C. 8.0x10-4J
  • D. 4.0x10-4J
  • E. 2.0x10-4J
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Correct Answer: Option B
Explanation
E = 1/2cv2 = 1/2 x 10 x 10-6 x 402 = 1.6 x 10-2J
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