Three-dimensional potential of a homogeneous circular torus in terms of equigravitating elements

The complete system of the simplest equigravitating elements presented for a homogeneous circular torus comprises a compound one-dimensional rod consisting of three links with a purely imaginary density, as well as two real point masses located at the ends of the rod. In terms of these elements, the three-dimensional gravitational potential of the torus at an arbitrary point is derived. The surface of the potential is constructed, and the family of equipotential curves is found.