Resonance occurs whenever the phase angle of the circuit is zero, The only way that f = 0 is if XL = XC
Note that tanϕ = \(\frac{ X }{ R}\) where X = reactance and ϕ = angle of lead or lag.
therefore, tan ϕ = \(\frac{ X_L - X_C}{ R}\) but at resonance \(X_L = X_C\)
tan ϕ = \(\frac{0}{R}\) = 0 and ϕ = \(tan^{-1}\) = 0º
There is an explanation video available below.
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