When resonance is produced in a series LCR circuit, then which of the following is not correct? (a) Current in the circuit is in phase with the applied voltage. (b) Inductive and capacitive reactances are equal. (c) If R is reduced, the voltage across capacitor will increase. (d) Impedance of the circuit is maximum.

Answer: (d). (a) True: φ = 0 at resonance. (b) True: XL = XC. (c) True: smaller R gives larger I = V/R, so VC = I XC increases. (d) False: impedance Z = R is minimum, not maximum. So the answer is (d).

When resonance is produced in a series LCR circuit, then which of the… | JEE Main 2013 (25 Apr, Shift 1)

Q105JEE Main 2013 · 25 APR · SHIFT 1Easy

Resonance, Bandwidth & Q Factor

When resonance is produced in a series LCR circuit, then which of the following is not correct?

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Answer: (d)

(a) True: $\phi = 0$ at resonance. (b) True: $X_L = X_C$ .
(c) True: smaller $R$ gives larger $I = V/R$ , so $V_C = I X_C$ increases.
(d) False: impedance $Z = R$ is minimum, not maximum.
So the answer is (d).

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