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MODEL PAPER 2 — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsMODEL PAPER 21 Mark
MCQ
The electrostatic force between the metal plates of an isolated parallel capacitor C having a charge Q and area A is:
  • A
    independent of the distance between the plates
  • B
    inversely proportional to the distance between the plates
  • C
    proportional to the square root of the distance between the plates
  • D
    linearly proportional to the distance between the plates
✓

Answer

(a) independent of the distance between the plates
Explanation: $F=Q E=Q \frac{\sigma}{2 \varepsilon_0}=Q \frac{Q}{2 A \varepsilon_0}=\frac{Q^2}{2 A \varepsilon_0}$
F is independent of the distance between the plates.

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