Resonance
Resonance: Overview
This topic covers concepts, such as Resonance, Phasor Diagram for Series L-C-R Circuit at Resonance, Resonance Frequency, Current versus Frequency Graph for L-C-R Series Circuit, Application of Resonance AC Circuit, Quality Factor, etc.
Important Questions on Resonance
Graph showing variation of current with frequency of source in a series circuit is,

A series RLC is to be designed for channel selection in a remote. Which of these combinations will you choose?

The reading of ammeter in the circuit shown will be

In the circuit shown in figure current in the circuit is

Voltage across resistance versus frequency graph of LCR circuit is shown. The bandwidth of circuit is:

In series L-C-R circuit and , find -factor of resonance circuit.

In the following circuit the readings of AC voltmeters and ammeters will be respectively-

Assertion: In series LCR circuit, the resonance occurs at one frequency only.
Reason: At resonance the inductive reactance is equal and opposite to the capacitive reactance.

The inductance of the oscillatory circuit of the radio station is and its capacitance is . Taking the effect of resistance negligible, wavelength of the broadcasted waves will be (velocity of light )

In LCR series circuit , then bandwidth of resonance is

The bandwidth of resonance in the A.C. circuit is proportional to inductance.

If the value of C in a series RLC circuit is decreased, the resonant frequency.

For an RLC circuit driven with voltage of amplitude and frequency the current exhibits resonance. The quality factor, is given by

The inductance of the oscillatory circuit of the radio station is and its capacitance is . Taking the effect of resistance negligible, wavelength of the broadcasted waves will be (velocity of light )

Which one is the expression of resonant frequency in a series resonant circuit?

A parallel L-C circuit comprises of a 5H inductor and capacitor. The resonant frequency of the circuit in is

In the given figure, which point shows the resonant state?

Which of the following combinations should be selected for better tuning an L.C.R. circuit used for communication?

Which of the following combination should be selected for better sharpness of tuning circuit?

The given figure represents the phasor diagram of a series circuit connected to an ac source. At the instant t' when the source voltage is given by , the current in the circuit will be :
