In the exercises of Irodov I.E. there are several tasks for finding the resistance of a system of
electrodes located in a uniform weakly conducting medium. The problem of finding resistance between two metal balls
is considered. It has been shown that the potentials of metal balls located in a weakly conducting homogeneous medium
influence each other. This effect was taken into account by introducing image charges. Using the image method for a
sphere, the dependence of the system resistance on the distance between the balls is found. Previously, only the limiting
case was considered when the distance between the balls is much larger than the radius of the balls.