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Electrostatic Potential and Capacitance — Physics STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 SciencePhysicsElectrostatic Potential and Capacitance3 Marks
Question
Three circuits, each consisting of a switch ‘S’ and two capacitors, are initially charged, as shown in the figure. After the switch has been closed, in which circuit will the charge on the left-hand capacitor (i) increase, (ii) decrease and (iii) remain same? Give reasons.

✓

Answer

VL = 3𝑉 VR = 3𝑉 (L: Left, R: Right)
VL = 6𝑉 VR = 3𝑉  
VL = 2𝑉 VR= 3𝑉  

Reasons:

  1. No change – (potential same on both capacitors as (VL = VR).
  2. Charge on left hand capacitor will decrease (VL > VR).
  3. Charge on left hand capacitor will increase (VR > VL).

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