The term ‘Susceptance’ (symbolized as ‘B’) refers to the measurement of ease of dynamic effects of permitting the flow of charge or current to polarization. It is the imaginary part of admittance(vector quantity). Susceptance is a scalar quantity and is measured in siemens or S.

It was termed as permittance due to its property by Oliver Heaviside in June, 1887.

The susceptance may be negative or positive depending upon the inductive or capacitive circuitry respectively. However, the magnetic circuits are inductive an electric circuits are capacitive in this case.

The counter part of it is conductance (symbolized as ‘G’). Mathematical expression will be as understated:-

Y= G + jB siemens