Q.

In the given circuit, a charge of +80μC is given to the upper plate of the 4μF capacitor. Then in the steady state, the charge on the upper plate of the 3μF capacitor is      [2012]

1 +32μC  
2 +40μC  
3 +48μC  
4 +80μC  

Ans.

(3)

The total charge on plate A will be 80μC.

The 2μF and 3μF capacitors are in parallel. Therefore,

Ceq=2+3=5μF

Charge on the capacitor of capacitance 3μF is

q=35×80=48μC