Question

In LCR series resonance circuit, choose the wrong statement

• A. Resonance occurs at XL = XC
• B. At resonance, current has a maximum value
• C. At resonance, circuit is purely inductive
• D. At resonance, impedance is minimum

Answer 1

Answer: (C)

At resonance, circuit is purely inductive

Answer 2

At resonance in an LCR series resonance circuit, the circuit is not purely inductive. It is actually a combination of both inductive and capacitive reactances canceling each other out. At resonance, the inductive reactance (XL) and the capacitive reactance (XC) are equal in magnitude but opposite in sign, resulting in their cancellation. As a result, the circuit becomes predominantly resistive, and the impedance is at its minimum value.
Therefore, the correct statement is (C) at resonance, the circuit is not purely inductive.