Q.

Figure shows a series LCR circuit connected to a variable frequency 200V source. L = 5H, C = 80μF and R = 40 Ω What is the source frequency which drives the circuit at resonance?

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a

25 Hz

b

25πHz

c

50 Hz

d

50πHz

answer is B.

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Detailed Solution

ω0=1LC=12×10−2 or, 2πf=50 or ,f_ =25πHz .

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Figure shows a series LCR circuit connected to a variable frequency 200V source. L = 5H, C = 80μF and R = 40 Ω What is the source frequency which drives the circuit at resonance?