[en] The power losses and its two constituent terms due to dissipated and reactive energies are developed for a system of a normal conducting wire (two wires) carrying a current parallel to a type II superconducting infinite slab of arbitrary thickness. The reactive term is found to be either capacitively or inductively reactive. When the thickness of the slab tends to infinity it is found that the results will be in a good agreement with the previous results. (author). 7 refs, 2 figs