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प्रश्न
Which one of the following curves represents the variation of impedance (Z) with frequency f in series LCR circuit?
पर्याय
MCQ
आलेख
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उत्तर
Explanation:
`"Z" = sqrt ("R"^2 + (2pi"fL" - 1/ (2pi"fC"))^2`
From above equation at `"f" = 0 Rightarrow "z" = infty`
`"when f" = 1/(2pi sqrt"LC")` (resonant frequency)
` Rightarrow "Z" = "R"`
`"for" "f" > 1/ (2pi sqrt"LC") Rightarrow "Z"` starts increasing
`"i.e., for frequency" 0 - "f"_"r", "Z decreases and for" "f"_"r" "to" infty, "Z increases This is justified by graph C."`
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