Easy
Two identical capacitors are joined in parallel,charged to potential $V$,separated and then connected in series,$i.e.$,the positive plate of one is connected to the negative plate of the other. Then
- Athe charges on the free plates connected together are destroyed
- Bcharges on the free plates are destroyed
- Cthe energy stored in the system increases
- Dthe potential difference between the free plates is $2\,V$
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