However, this method is too complicated to utilize in this field (for example, in the case of indirect feeding). Moreover, such an analysis is not universal and will vary from a circuit to another circuit. For example, if external capacitance is added to the coil, the whole model must be recalculated. In contrast, CMT provides an accurate and convenient way of modeling of the system and, as it was presented in section 2.4, expresses the system as a set of linear differential equations given by (80).