The energy stored in a charged capacltor is given by:
Correct answer: D. Both A and B
- A. 1/2 CV2
- B. 1/2 QV
- C. 1/2 m v2
- D. Both A and B
Explanation
The correct answer is Option D: Both A and B. The energy stored in a charged capacitor can be represented by the formulas E = 1/2 CV² or E = 1/2 QV. Option A and B both correctly represent the energy stored in a charged capacitor. Option C is incorrect as 1/2 mv² is the formula for kinetic energy, not the energy stored in a capacitor.
This question appeared on the ETEA MDCAT 2013 paper, which you can sit online with every answer explained.
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About Capacitors
Capacitors store electric charge and energy in an electric field between conductors. Work includes capacitance, the relation Q = CV, dielectric materials, charging and discharging, energy formulas, and combinations of capacitors in series and parallel. Electric potential difference is needed to understand why charge and stored energy change.
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