Which one of the following curves represents the variation of impedance (Z) with frequency f in a series L-C-R circuit, when connected to an AC source?

Step-by-step solution

Impedance (Z) of a series L-C-R circuit is given as = R^2+ ( L- 1 C )^2 At X_L=X_C , then from Eq. (i), Z_ =R , and f=f₀ [f₀= . resonance frequency ] Hence, the variation of Z with frequency f in a series L-C-R circuit is given as