Question

Two identical capacitors are joined in parallel, charged to a potential $V$ , separated and then connected in series, the positive plate of one is connected to the negative of the other. Which of the following is true?

• A. The charges on the free plated connected together are destroyed
• B. The energy stored in the system increases
• C. The potential difference between the free plates is $2 V$
• D. The potential difference remains constant

Answer 1

Answer: (C)

The potential difference between the free plates is $2 V$

Answer 2

When the two capacitors charged to same potential are connected in series, then total potential difference $V' = V_{1}+V_{2} = V+V = 2V$