If the voltage and current in an AC circuit are given by v = 200 sin(ωt + 30°) and i = 10 sin(ωt - 60°), then the power factor of the circuit is:

In an inductive circuit, a resistance of 2 Ω is connected in series with an inductor having an inductive reactance of 4 Ω. Determine the power factor of the circuit when connected to a single-phase AC supply.

A capacitor draws a reactive power of 100 VAR due to a current of 0.87 A. Determine the capacitive reactance (XC) of the capacitor.