Which formula is used to calculate inductive reactance?

Inductive reactance is a measure of the opposition that an inductor presents to the change of current. The correct formula to calculate inductive reactance is given by 2πfL, where "f" represents the frequency of the alternating current in hertz, and "L" stands for the inductance of the coil in henries.

This formula arises from the principles of electromagnetic induction, where the reactance increases with both the frequency of the AC signal and the inductance of the coil. As either of these factors increases, the inductive reactance also increases, reflecting the inductor's growing opposition to the changing current.

The other choices involve different electrical properties. The formula 2πfC pertains to capacitive reactance relating to capacitors, R = V/I represents Ohm's law for resistors, and Q = C * V describes the relationship between charge, capacitance, and voltage. Each of these formulas serves a distinct purpose within electrical circuits but does not apply to the calculation of inductive reactance.