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Question

Figure shows a series LCR circuit connected to a variable frequency 200V source. The source frequency which drives the circuit at resonance is

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A
50 Hz
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B
(50 /π )Hz
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C
25 Hz
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D
(25 /π ) Hz
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Solution

The correct option is B (25 /π ) Hz
For resonance frequency

XL=XC

ωL=1ωC

2πf=1LC

f=12π×1LC

=12π×15×80×106

=12π×10320

=25πHz

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