Question

(a) Using phasor diagram for a series LCR

circuit connected to an ac source of voltage V = V0

sin wt, derive the relation for the current owing

in the circuit and the phase angle between the

voltage across the resistor and the net voltage in

the circuit.

(b) Draw a plot showing the variation of the

current I as a function of angular frequency

‘w’ of the applied ac source for the two cases

of a series combination of (i) inductance L1,

capacitance C1 and and resistance R1 and

(ii) inductance L2, capacitance C2 and resistance

R2 where R2 > R1. Write the relation between L1,

C1 and L2, C2 at resonance. Which one, of the

two, would be better suited for ne tuning in a

receiver set? Give reason.

Answer 1

Answer:

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