(a) A series LCR circuit is connected to an ac
source of variable frequency. Draw a suitable
phasor diagram to deduce the expressions for
the amplitude of the current and phase angle.
(b) Obtain the condition of resonance. Draw a
plot showing the variation of current with the
frequency of a.c. source for two resistances R1
and R2 (R1 > R2). Hence dene the quality factor,
Q and write its role in the tuning of the circuit.
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