# Magnetic reactance

Magnetic reactance [1][2][3] is the component of complex magnetic 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 $\tfrac{1}{\Omega}$ and is denoted by $x$ (or $X$). It may be inductive $x_L = \omega L_M$ or capacitive $x_C = \tfrac{1}{\omega C_M}$, where $\omega$ is the angular frequency of a magnetic current, $L_M$ is the magnetic inductivity of a circuit, $C_M$ is the magnetic capacitivity of a circuit. The magnetic reactance of an undeveloped circuit with the inductivity and the capacitivity, which are connected in series, is equal: $x = x_L - x_C = \omega L_M - \frac{1}{\omega C_M}$ . If $x_L = x_C$, then the sum reactance $x = 0$ and resonance takes place in the circuit. In the general case $x = \sqrt{z^2 - r^2}$. When an energy loss is absent ($r = 0$) $x = z$. The angle of the phase shift in a magnetic circuit $\phi = \arctan{\frac{x}{r}}$. On a complex plane, the magnetic reactance appears as the side of the resistance triangle for circuit of an alternating current.