Question

Which one of the following curves represents the variation of impedance (Z) with frequency f in series LCR circuit?

Answer 1

Answer:

OPTION c) is correct

Explanation:

Solution:

L-C-R series

$z = \sqrt{R^{2} +(x_{2}-y_2)^2}$

$\sqrt{R^2+(2\pi fL-\frac{1}{2\pi fc})^2 }$

At fr, XL=XC => Z = R = min

0-fr, At f = 0 => XL= 0 but XC = ∞

Z = ∞

F↑=> XL ↑and XC↓

so , Z ↓=

b/w fr -∞ At ∞ , XL = ∞  ...... }

                        XC = 0 ......} Z = ∞

fr-∞ XL↑ and XC↓

OPTION c) is correct