TS EAMCET 14-Sep-2020 Shift 2 Solved Paper

Impedance (Z) of a series L−C−R circuit is given as
Z‌‌=√R2+(XL−XC)2
‌‌=√R2+(ωL−‌

1

ωC

)2
⇒‌‌Z‌‌=√R2+(2πfL−‌

1

2πfC

)2
At XL=XC , then from Eq. (i),
Zmin=R , and f=f0‌‌[f0= resonance frequency]
Hence, the variation of Z with frequency f in a series L−C−R circuit is givenas