Capacitance of a Parallel Plate Capacitor

      Consider a parallel plate plate capacitor, fully charged as shown in the Fig 1.

      The area of each plate X and Y is say A m2 and plates are separated by distance 'd'.
      The relative permittivity of the dielectric used in between is say εr.
      Let Q be the charge accumulated on plate X, then the flux passing through the medium is Ψ = Q.

      The electric field intensity.

Note: when the capacitor is fully charged, the potential difference across it is equal to the voltage applied to it.

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