Alternating Current

If both the inductance $L$ and the capacitance $C$ in an LC circuit are doubled, the new natural frequency of the circuit will be:

In an LC oscillation cycle, at the instant when the current in the circuit is maximum, where is the energy of the system stored?

The natural frequency of oscillations in an LC circuit containing an inductor $L$ and a capacitor $C$ is given by the expression:

Which of the following physical quantities has the same unit as that of resistance in a series LCR circuit?

At the condition of resonance in a series LCR circuit, what is the phase difference between the current and the source voltage?

In a series LCR circuit, resonance occurs when the relationship between inductive reactance ($X_L$) and capacitive reactance ($X_C$) is:

Which of the following is the correct mathematical expression for the resonant frequency ($f_r$) of a series $LCR$ circuit?

The Quality factor ($Q$-factor) of an $LCR$ circuit is defined as the ratio of:

What is the phase difference between the current and the voltage in a series $LCR$ circuit at resonance?

The current in an AC circuit is termed 'wattless' when the phase difference between the voltage and the current is:

For an LCR series circuit, the power factor $\cos \phi$ is mathematically expressed as:

The average power dissipated in a purely inductive AC circuit over a complete cycle is:

The efficiency ($\eta$) of a transformer is mathematically expressed as:

The core of a transformer is laminated to specifically reduce which type of energy loss?

In an ideal step-down transformer, which of the following relations between the primary turns ($N_p$) and secondary turns ($N_s$) is correct?