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Question

VR & VC are output voltages across the resistor and capacitor respectively. Choose a correct option.

A
As frequency of source increases, VC increases.
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B
As frequency of source increases, VC decreases.
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C
VR is independent of frequency.
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D
VR decreases with an increment in frequency.
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Solution

The correct option is B As frequency of source increases, VC decreases.
VR=iR & i=εz=εR2+x2c
xc=1ωc

With an increment in ω, xc decreases, so i increases; hence, VR increases. Also, ε=V2R+V2C, so as VR increases, Vcdecreases.

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