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Calculate the energy stored in a 20\(\mu F\) capacitor. If the p.d between the plates...

Physics
WAEC 2004
Calculate the energy stored in a 20\(\mu F\) capacitor. If the p.d between the plates is 40V
  • A. 3.2 x 10-2J
  • B. 1.6 x 10-2J
  • C. 8.0 x 10-4J
  • D. 4.0 x 10-4J
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Correct Answer: Option B
Explanation
W = \(\frac{cv^2}{2} = \frac{20 \times 10^{-6} \times 40^{2}}{2}\)

= 1.6 x 10-2J
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