Charged plates, one after the other.

Four identical metallic plates (initially uncharged), each having area of cross section \(A,\) are each separated by a distance of \(d,\) as shown in the figure above. Plate 2 is given a charge of \(\mathbf Q.\) Plates 1 and 4 are both earthed via a very thin conducting wire. Find the potential difference between plates 2 and 3.

Details and Assumptions:

  • \(\epsilon_0\) denotes the permittivity of free space.
  • The plates are very large, and the phenomena of fringing of electric field lines are neglected.
  • Because of the large size, the electric field due to any particular plate is considered as that of an infinitely large, thin conducting plate.

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