[amp_mcq option1=”capacitive reactance is greater than the inductive reactance” option2=”inductive reactance is greater than the capacitive reactance” option3=”inductive reactance is equal to the capacitive reactance” option4=”the difference between inductive and capacitive reactance is equal to the resistance E. None of the above” correct=”option3″]
The correct answer is: C. Inductive reactance is equal to the capacitive reactance.
When a parallel RLC circuit is operating at its resonant frequency, the inductive reactance and the capacitive reactance are equal in magnitude but opposite in sign, so they cancel each other out. This means that the only impedance in the circuit is the resistance, and the current through the circuit is at its maximum.
Option A is incorrect because the capacitive reactance is greater than the inductive reactance when the frequency is below the resonant frequency.
Option B is incorrect because the inductive reactance is greater than the capacitive reactance when the frequency is above the resonant frequency.
Option D is incorrect because the difference between inductive and capacitive reactance is equal to zero when the frequency is at the resonant frequency.
Option E is incorrect because the inductive reactance and the capacitive reactance are equal in magnitude but opposite in sign when the frequency is at the resonant frequency.