For many small scatterers α <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">ee</sub> α <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">mm</sub> = α <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">me</sub> α <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">em</sub> . However, it is possible to find others that strongly violate this rule. By using a multiple expansion on the electromotive force of an equivalent circuit equation obtained via the complex Poynting's theorem, here we demonstrate that the rule is valid when the expansion can be truncated at the dipole moments.