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

50 Hz 

c

25πHz

d

50πHz

answer is B.

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Detailed Solution

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ω0=1LC=12×102 2πf=50 f=25πHz .

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