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Two capacitors of capacitances 3muF and ...

Two capacitors of capacitances `3muF` and `6muF` are charged to a potential of `12V` each. They are now connected to each other, with the positive plate of each joined to the nagative plate of the other.
(A) the common potential will be `12V`
(B) the loss in energy will be `576muJ`
(c) the common potential will be `4V`
(D) the loss in energy will be `144 muJ`

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