Question

An LCR series circuit with 100 Ω resistance is connected to an ac source of 200 V and angular frequency 300rad/s. When only the capacitance is removed, the current lags behind the voltage by 60°. When only the inductance is removed, the current leads the voltage by 60°. Calculate the current and the power dissipated in the LCR circuit.

Answer 1

Now when capacitance is removed;

Now given that current lags behind voltage by 60°,

Now when the inductance is removed; 

By intuition we can say that

Now when all together are present