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From the diagram above, calculate the energy stored in the capacitor

Physics
JAMB 2017

From the diagram above, calculate the energy stored in the capacitor
  • A. 4.0 x 10\(^{-2}\)J
  • B. 4.0 x 10\(^{-4}\)J
  • C. 8.0 x 10\(^{-4}\)J
  • D. 8.0 x 10\(^{-2}\)J
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Correct Answer: Option B
Explanation
c = 8µF, v = 10v

Energy stored = \(\frac{1}{2}\) cv2

= \(\frac{1}{2}\) × (8 × 10− 6) × 102

= 4 × 10\(^{-4}\)

There is an explanation video available below.


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Explanation Video

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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
WAEC offline past questions - with all answers and explanations in one app - Download for free