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The shape of impedance versus frequency curve for a parallel resonance circuit is of the shape as shown in:

The shape of impedance versus frequency curve for a parallel resonance circuit is of the shape as shown in: Correct Answer figure A

The correct answer is 'option 1'

Concept:

  • Parallel resonance occurs when the supply frequency creates zero phase difference between the supply voltage and current producing a resistive circuit

[ alt="F1 Shraddha Ravi R 24.02.22 D1" src="//storage.googleapis.com/tb-img/production/22/02/F1_Shraddha_Ravi%20R_24.02.22_D1.png" style="width: 273px; height: 232px;">

  • If the impedance of the parallel circuit is at its maximum at resonance then consequently, the admittance of the circuit must be at its minimum and one of the characteristics of a parallel resonance circuit is that admittance is very low limiting the circuit's current.
  • Unlike the series resonance circuit, the resistor in a parallel resonance circuit has a damping effect on the bandwidth of the circuit making the circuit less selective.
  • Also, since the circuit current is constant for any value of impedance, Z, the voltage across a parallel resonance circuit will have the same shape as the total impedance and for a parallel circuit, the voltage waveform is generally taken from across the capacitor.
  • We now know that at the resonant frequency, ƒr the admittance of the circuit is at its minimum and is equal to the conductance, G is given by 1/R because in a parallel resonance circuit the imaginary part of admittance, i.e. the susceptance, B is zero because BL = BC as shown.
  • The shape of impedance versus frequency is shown below

[ alt="F1 Shraddha Ravi R 24.02.22 Correction 1" src="//storage.googleapis.com/tb-img/production/22/02/F1_Shraddha_Ravi%20R_24.02.22_Correction%201.png" style="width: 138px; height: 126px;">

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