When XL and xc are equal?

XL (inductive reactance) and XC (capacitive reactance) are equal when the circuit is at resonance, typically in an RLC circuit. This condition occurs at a specific frequency known as the resonant frequency, where the inductive and capacitive effects cancel each other out, resulting in a purely resistive impedance. Mathematically, this can be expressed as XL = XC, or (2\pi f L = \frac{1}{2\pi f C}), where f is the frequency, L is inductance, and C is capacitance. At this point, the circuit can maximize current flow and minimize impedance.