A resistor, an inductor and a capacitor are connected in series with a variable frequency source of alternating emf. At resonance, the amplitude of current depends on :

(A) Resistance
(B) Inductance
(C) Capacitance
(D) Frequency of source

Choose the correct answer from the options given below:

(A) only

At Resonance $X_C = X_L$

$\Rightarrow Z = R$

$ I = \frac{\xi}{R} = \frac{\xi_0}{R} sin(\omega t+ \phi)$

$\text{Current Amplitude} I_0 = \frac{\xi_0}{R}$

$\Rightarrow \text{ Current Amplitude depends only on Resistance}$