The impedance of a series L-C-R circuit at resonance is: 

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  1. (X- XC)
  2. \(\rm \sqrt{Z^2+(R-X_C)^2}\)
  3. \(\rm \sqrt{R^2+(X_L-X_C)^2}\)
  4. R

Answer (Detailed Solution Below)

Option 4 : R
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Detailed Solution

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Concept:

  • Resonance: It is a phenomenon in which a vibrating system or external force drives another system to oscillate with greater amplitude at specific frequencies.
    • Example: Playground swing, which acts as a pendulum.
  • Average power: It is the average amount of work done or energy converted per unit of time.
  • SI unit: watt (W)
  • Impedance: It is the measure of the total opposition provided by the circuit or a part of a circuit presents to electric current.
    • Impedance includes both resistance and reactance

The impedance of the series RLC circuit is given by,

\({\bf{Z}} = \sqrt {{{\bf{R}}^2} + {{\left( {{{\bf{X}}_{\bf{C}}} - {{\bf{X}}_{\bf{L}}}} \right)}^2}} \)

Where XC = Capacitive reactance, XL = Inductive reactance, Z = Total circuit impedance

At Resonance XC = XL

Z = R

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