Question
Which one of the following curves represents the variation of impedance $$\left( Z \right)$$ with frequency $$f$$ in series $$LCR$$ circuit?
A.
B.
C.
D.
Answer :
Solution :
Impedance at resonant frequency is minimum in series $$LCR$$ circuit.
So, $$Z = \sqrt {{R^2} + {{\left( {2\pi fL - \frac{1}{{2\pi fC}}} \right)}^2}} $$
When frequency is increased or decreased, $$Z$$ increases.
Impedance at resonant frequency is minimum in series $$LCR$$ circuit.
So, $$Z = \sqrt {{R^2} + {{\left( {2\pi fL - \frac{1}{{2\pi fC}}} \right)}^2}} $$
When frequency is increased or decreased, $$Z$$ increases.
