Question

A coil of resistance S D and self-inductance 0.2 H is connected in series with a variable capacitor across a 30 V_(rms) 50 Hz supply. At what capacitance will resonance occur? Find the corresponding current.

Answer 1

Data: R = 5 Ω. 

L = 0.2 H, 

e_rms = 30 V. 

f = 50 Hz 

Let C be the capacitance of the capacitor at resonance.

(i) At resonance,

(ii) At resonance, the current (i_rms) is maximum and it is given by