Magnetic reactance is the component of magnetic complex impedance of the alternating current circuit, which produces the phase shift between a magnetic current and magnetic tension in the circuit. It is measured in units of 1 Ω Ω and is denoted by x (or X ). It may be inductive x L = ω ω L M or capacitive x C = 1 ω ω C M , where ω ω is the angular frequency of a magnetic current, L M is the magnetic inductiance of a circuit, C M is the magnetic capacitance of a circuit. The magnetic reactance of an undeveloped circuit with the inductance and the capacitance which are connected in series, is equal: x = x L − − x C = ω ω L M − − 1 ω ω C M . If x L = x C , then the net reactance x = 0 and resonance takes place in the circuit. In the general case x = z 2 − − r 2 . When an energy loss is absent ( r = 0 ), x = z . The angle of the phase shift in a magnetic circuit ϕ ϕ = arctan ⁡ ⁡ x r . On a complex plane, the magnetic reactance appears as the side of the resistance triangle for circuit of an alternating current.