Two identical capacitors were initially connected in parallel and both of them acquired a common potential V…

Two identical capacitors were initially connected in parallel and both of them acquired a common potential V. If these capacitors are then separated and reconnected but this time in series, with the positive plate of one being connected to the negative of the other, then choose the true statement out of the following.
  1. The charges on the free plate connected together are destroyed.
  2. The energy stored in the system increases.
  3. The potential difference between the free plates is 2 V.
  4. The potential difference remains constant.

Solution

When the two capacitors charged to same potential are connected in series, then total potential difference
V'=V1+V2=V+V=2V ~

Asked in: JEE Mains - Capacitance - Test 2

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