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The switch S1 is kept closed for long. N...

The switch `S_1` is kept closed for long. Now, at t = 0s, switch `S_1` is opened and `S_2` is closed. The charge on capacitor `C_2` finally is

A

`100 mu C`

B

`120 mu C`

C

`50 mu C`

D

`80 mu C`

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