Capacitors C and 2C are connected in parallel and charged to potential V. The battery is removed and a dielectric of constant K is inserted fully into capacitor C. The final potential across each capacitor is:
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Question

Capacitors C and 2C are connected in parallel and charged to potential V. The battery is removed and a dielectric of constant K is inserted fully into capacitor C. The final potential across each capacitor is:

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G1 Physics · Accepted Answer

Total isolated charge remains Qₜₒₜ=(C+2C)V=3CV. Final equivalent capacitance is KC+2C=(K+2)C. Hence Vf=3V/(K+2). Correct answer: C.