At resonance in R.L.C series A.C circuit which is correct:
Correct answer: A. The impedance is minimum
- A. The impedance is minimum
- B. The voltage across the inductor (VL) is greater than the applied voltage
- C. The voltage across the capacitor (VC) is greater than the applied voltage
- D. All of the above
Explanation
In an RLC series AC circuit at resonance, the impedance is at its minimum. This occurs because the inductive reactance (XL) equals the capacitive reactance (XC), thus canceling each other out, leaving only the resistive component. Therefore, the circuit behaves as if it only has resistance, leading to the lowest possible impedance. Options B and C discuss phenomena that can occur at resonance due to voltage magnification, but they do not define resonance. Option D is incorrect because not all statements are correct in the context of resonance definition.
Last updated
About Alternating Current
Alternating current varies periodically, so phase relationships become essential when current passes through a resistor, capacitor or inductor. The chapter distinguishes resistance from capacitive and inductive reactance, explains phase lead and lag, and connects changing electric and magnetic fields with the production and properties of electromagnetic waves.
Practise Alternating Current
592 free Alternating Current MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Physics questions like this
Physics is on 13 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
220V, 50 Hz AC supply is connected across a resistor of 50 k ohms. The current at time t Seconds, assuming that it is zero at t = O, is?
220V, 50 Hz AC supply is connected across a resistor of 50 k ohms. The current at time t Seconds, assuming that it is zero at t = O, is?
A 10 Ω resistor and a 40 μF capacitor are connected in parallel to a 110 V, 50 Hz AC supply. The total current is:
A 100 μF capacitor is connected to a 120 V (rms) AC source at 50 Hz. What is the rms current in the circuit?
A 100 μf capacitor will offer a reactance of: