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

$V' = V_{1} + V_{2} = V + V = 2V$