In an LCR circuit R =100 ohm. When capacitance C is removed, the current lags behind the voltage byπ3 . When inductance L is removed, the current leads the voltage by π3 The impedance of the circuit is

When C is removed circuit becomes RL circuit hence tan nπ3=XLRWhen L is removed circuit becomes RC circuit hence tan π3=XCRFrom equation (1) and (2) we obtain L C X 1 X 2This is the condition of resonance and in resonance Z=R=100Ω