Electric potential due to conductors and cavities

Inside a neutral spherical conductor, a spherical cavity is present. A charge Q is placed inside the cavity. What is the electric potential at the center (C) of the cavity?

In the diagram above,

  • \(r_1\) is the distance of the charge from the cavity's center C;
  • \(r_2\) is the radius of the cavity;
  • \(r_3\) is the distance between the centers of the sphere and cavity;
  • \(r_4\) is the radius of the sphere.
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