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JEE Advanced 2013Paper 1
Exam
JEE Advanced
Year
2013
Paper
Paper 1
Subject
Physics
Chapter
Capacitance

JEE Advanced 2013 · Paper 1 · Physics · Capacitance

In the circuit shown in the figure, there are two parallel plate...

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 the released. The switch S2 is then pressed to charge the capacitor C2. After some time, S2 is released and then is S3 pressed. After some time,
In the circuit shown in the figure, there are two parallel plate capacitors each of capacitance C . The switch S 1 is

Options

  1. Athe charge on the upper plate of C1 is 2CV0 .
  2. Bthe charge on the upper plate of C1 is CV0 .
  3. Cthe charge on the upper plate of C2 is 0.
  4. Dthe charge on the upper plate of C2 is - CV0 .

Correct answer

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

Step-by-step solution

When S1 is closed,
charge on C1=2V0C{\text{C}}_{1} = 2 {\text{V}}_{0} \text{C}
After S2 is closed, half of the change will move to C2
∴∴ charge on C1=122V0C{\text{C}}_{1} = \dfrac{1}{2} 2 {\text{V}}_{0} \text{C}
when S2 is closed,
charge on C2=V0C{\text{C}}_{2} = {\text{V}}_{0} \text{C} but with reversed polarity,
∴∴ Charge on upper plate =−V0C= - {\text{V}}_{0} \text{C}
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