MCQ practice · SSC Physics Board questions · Chapter 10: Static Electricity
If the capacitance of a capacitor is C and the voltage is V, the energy stored inside it is:
Think it through first, then pick an option.
- a ½VC²
- b ½CV
- c ½CV²
- d ½C²V²
Answer and explanation
Correct answer: c ½CV²
A capacitor of capacitance C at voltage V stores energy = ½CV².
Why the other options are wrong
- a ½VC²: The square is on C here; in the book it is on V: energy = ½CV².
- b ½CV: This has no square on V; in the book energy = ½CV², not just ½CV.
- d ½C²V²: Here both C and V are squared; in the book only V is squared: ½CV².
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