A capacitor is connected to an AC power supply. In this circuit, the current lag

Question

A capacitor is connected to an AC power supply. In this circuit, the current lags the voltage by 45deg. leads the voltage by 90deg. leads the voltage by 45deg. lags the voltage by 90deg. is in phase with the voltage. If the inductance and the capacitance both double in an LRC series circuit, the resonant frequency of that circuit will decrease to one-half its original value. increase to twice its original value. decrease to one-eighth its original value. decrease to one-fourth its original value. increase to four times its original value.

Explanation / Answer

8) In AC capacitor circuit current remain 90 degree ahead of voltage

So option B is correct

9) In series RLC circuit resonance frequency is

w = 1/ sqrt(LC)

If L and C both become double then angular frequency will become 1/sqrt(4) times

= 1/2 times of initial value

So it will decrease by one half of its original value

Option A is correct

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