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Question

A resistance of 10 Ω capacitance of 0.1μF and an inductance of 2mH are connected in series across source of alternating emf of variable frequency. At that frequency does maximum current flow?

A
11.25 kHz
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B
23.76 kHz
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C
35.46 kHz
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D
46.72 kHz
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Solution

The correct option is A 11.25 kHz
XL=Xc;Lω =1ωC
f=12π1LC=12π12×103×0.1×106
f=12π12×1010=1052×3.14×1.414=11.25kHz

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