MHT CET · Physics · Capacitance

A battery is used to charge a parallel plate capacitor till the potential difference between the plates becomes equal to the e.m.f of the battery. The ratio of the energy stored in the capacitor to the work done by the battery will be

A 2
B \(\frac{1}{2}\)
C 1
D \(\frac{1}{4}\)

Verified Solution

Answer & Solution

Correct Answer

(B) \(\frac{1}{2}\)

Step-by-step Solution

Detailed explanation

Energy stored in the capacitor, \(\mathrm{U}=\frac{1}{2} \mathrm{qV}\) Work done by the battery, \(\mathrm{W}=\mathrm{qV}\)
\(\therefore \frac{\mathrm{U}}{\mathrm{W}}=\frac{1}{2}\)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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