Two identical capacitors are joined in parallel, charged to a potential $V$ and then separated and then connected in series $i.e.$ the positive plate of one is connected to negative of the other
  • A
    The charges on the free plates connected together are destroyed
  • B
    The charges on the free plates are enhanced
  • C
    The energy stored in the system increases
  • DThe potential difference in the free plates becomes $2\,V$
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