$n$ identical condensers are joined in parallel and are charged to potential $V$. Now they are separated and joined in series. Then the total energy and potential difference of the combination will be

  • A

    Energy and potential difference remain same

  • B

    Energy remains same and potential difference is $nV$

  • C

    Energy increases $n$ times and potential difference is $nV$

  • D

    Energy increases $n$ times and potential difference remains same

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