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,

  • r1r_1 is the distance of the charge from the cavity's center C;
  • r2r_2 is the radius of the cavity;
  • r3r_3 is the distance between the centers of the sphere and cavity;
  • r4r_4 is the radius of the sphere.
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