(a) In a series LCR circuit connected across an a.c. source of variable frequency, obtain the expression for its impedance and draw a plot showing its variation with frequency of the a.c. source. (b) What is the phase difference between the voltages across inductor and the capacitor at resonance in the LCR circuit ? (c) When an inductor is connected to a 200 V d.c. voltage, a current of 1 A flows through it. When the same inductor is connected to a 200 V, 50 Hz a.c. source, only 0.5 A current flows. Explain, why ? Also, calculate the self inductance of the inductor.

(a) In a series LCR circuit connected across an a.c. source of variabl

1.	(a) In a series LCR circuit connected across an a.c. source of variable frequency, obtain the expression for its impedance and draw a plot showing its variation with frequency of the a.c. source. (b) What is the phase difference between the voltages across inductor and the capacitor at resonance in the LCR circuit ? (c) When an inductor is connected to a 200 V d.c. voltage, a current of 1 A flows through it. When the same inductor is connected to a 200 V, 50 Hz a.c. source, only 0.5 A current flows. Explain, why ? Also, calculate the self inductance of the inductor.
Answer» ANSWER :( C) 1.1 H

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