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Q.

The following series L-C-R circuit, when driven by an e.m.f. source of angular frequency 70 kilo-radians per second, the circuit effectively behaves like

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a

purely resistive circuit

b

series R-L circuit

c

series R-C circuit 

d

series L-C circuit with R=0

answer is C.

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Detailed Solution

XL=Lω=100×106×70×103=7ΩXc=1cω=1106×70×103=1007=14.28

AS  Xc is more than XL it behaves as a CR circuit.

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