Question

In a series LCR circuit R = 200Ω and the voltage and the frequency of the main supply is 220V and 50Hz respectively. On taking out the capacitance from the circuit the current lags behind the voltage by 30°. On taking out the inductor from the circuit the current leads the voltage by 30°. The power dissipated in the LCR circuit is

(a) 242W 

(b) 305W

(c) 210W 

(d) zeroW

Answer 1

(a) : Here, R = 200Ω, V_rms = 220 V,υ = 50 Hz
When only the capacitance is removed, the phase difference between the current and voltage is

When only the inductance is removed, the phase
difference between current and voltage is