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A fascinating behaviour of the series RL...

A fascinating behaviour of the series RLC circuit is the phenomenon of resonance.
a. Explain Resonance in an LCR circuit. b. Draw a graphical representation of variation of current amplitude in with frequency w. c. What do you mean by sharpness of resonance? Explain it.

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Step by step text solution for A fascinating behaviour of the series RLC circuit is the phenomenon of resonance. <BR> a. Explain Resonance in an LCR circuit. b. Draw a graphical representation of variation of current amplitude in with frequency w. c. What do you mean by sharpness of resonance? Explain it. by PHYSICS experts to help you in doubts & scoring excellent marks in Class 12 exams.

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What do you mean by resonant frequency ?

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Knowledge Check

  • An A.C. source of variable frequency f is connected to an LCR series circuit. Which one of the graphs represents the variation of current I in the circuit with frequency f?

    A
    B
    C
    D

  • In LCR circuit when X_(L)=X_(C) (at resonance) the current ……… .

    A
    is zero
    B
    is in phase with the voltage leads the voltage
    C
    leads the voltage
    D
    lags behind the voltage

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    A series LCR circuit with L = 0.12 H, C = 480 nF, R = 23Omega is connected to a 230 V variable frequency supply. a. What is the source frequency for which current amplitude is maximum? Obtain this maximum value. b. What is the source frequency for which average power absorbed by the circuit is maximum? Obtain the value of this maximum power. c. For which frequencies of the source is the power transferred to the circuit half the power at resonant frequency? What is the current amplitude at these frequencies? d. What is the Q-factor of the given circuit?

    Figure shows a series LCR circuit connected to a variable frequency 230 V source. L = 5.0 H, C = 80 muF, R= 40Omega a. Determine the source frequency which drives the circuit in resonance b. Obtain the impedance of the circuit and the amplitude of current at the resonating frequency. c. Determine the rms potential drops across the three elements of the circuit. Show that the potential drop across the LC combination is zero at the rasonating frequency .

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