  We provide an explicit, closed and compact expression for the Debye
superpotential of a circular source. This superpotential is obtained by
integrating the Green function of Teukolsky Master Equation (TME). The Debye
potential itself is then, for a particular configuration, calculated in the
same manner as the $\phi_0$ field component is calculated from the Green
function of the TME -- by convolution of the Green function with sources. This
way we provide an exact field of charged ring and circular current on the Kerr
background, finalizing thus the work of Linet.
