C₁ = 3μF, C₂ = 6μF & V = 12V each
∴ Q = CV
⇒ Q₁ = 36μC & Q₂ = 72μC
After +ve & −ve plates of both capacitor are joined together, then
Qnet = 72 − 36 = 36μC
& Cnet = 3 + 6 = 9μF
∴ V = Q/C = 36/9 = 4V
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