Q.

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

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

Ans.

(3)

The total charge on plate A will be 80 μC.

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

Ceq=2+3=5 μF

Charge on the capacitor of capacitance 3 μF is

q=35×80=48 μC