Question

In the circuit shown in the figure, there are two parallel plate capacitors each of capacitance C. The switch S₁ is pressed first to fully charge the capacitor C₁ and then released. The switch S₂ is then pressed to charge the capacitor C₂. After some time, S₂ is released and then S₃ is pressed. After some time, 

(A) the charge on the upper plate of C₁ is 2CV₀. 

(B) the charge on the upper plate of C₁ is CV₀. 

(C) the charge on the upper plate of C₁ is 0. 

(D) The charge on the upper plate of C₂ is -CV₀ .

Answer 1

(B) the charge on the upper plate of C₁ is CV₀. 

(D) The charge on the upper plate of C₂ is -CV₀ .

After switch S₁ is closed, C₁ is charged by 2CV₀, when switch S₂ is closed, C₁ and C₂ both have upper plate charge CV₀. 

When S₃ is closed, then upper plate of C₂ becomes charged by -CV₀ and lower plate by +CV₀.