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In electrical engineering, susceptance (variable B) is the inverse or reciprocal of reactance X:
B = X^{-1} = 1/X <math>
Just as reactance is the imaginary part of impedance, susceptance is the imaginary part of admittance:
Y = G + j B <math>
The magnitude of admittance is given by:
Y = \sqrt {G^2 + B^2} <math>
Y is the admittance, G is the conductance, and B is the susceptance.