First slide

Phasors and Phasor Diagrams

Question

A series LCR circuit is connected to ac source of variable frequency 'f '. The graphical representation of variation of impedance 'z' of the circuit with frequency f will be :

Moderate

A
B
C
D

Solution

For series LCR circuit
$Z = \sqrt{R^{2} + {(X_{L} - X_{C})}^{2}}$
So, Z_min = R
Which is shown in Fig. 10.62.

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