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Q.

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

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a

11.25 kHz

b

23.76 kHz

c

35.46 kHz

d

46.72 kHz

answer is A.

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Detailed Solution

At resonance xL=xC ⇒ f0=12π LC=12π2×10−3×0.1×10−6=11.25kHz

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