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:
Answer & explanation
Correct answer: option 1
At Resonance $X_C = X_L$
$\Rightarrow Z = R$
$ I = \frac{\xi}{R} = \frac{\xi_0}{R} sin(\omega t+ \phi)$
$\text{Current Amplitude} I_0 = \frac{\xi_0}{R}$
$\Rightarrow \text{ Current Amplitude depends only on Resistance}$