Alternating Current - Electromagnetism - Physics Previous Year Questions

If the alternating current \(I=I_1 \cos \omega t+ I_2 \sin \omega t\) then the rms current is given by

A \(50 \mathrm{~Hz}\) \(\mathrm{AC}\) signal is applied in a circuit of inductance of \((1 / \pi) \mathrm{H}\) and resistance \(2100 \Omega\). The impedance offered by the circuit is

The alternating current in a circuit is given by \(I=50 \sin 314 t\). The peak value and frequency of the current are

The primary of a transformer has 400 turns while the secondary has 2000 turns. If the power output from the secondary at 1000 V is 12 kW . The resistance of the primary is $0.2 \Omega$ and that of the secondary is $2 \Omega$. If the efficiency of the transformer is $80 \%$, then the power loss in the primary is

A transformer has 200 windings in the primary and 400 windings in the secondary. The primary is connected to an AC supply of 110 V and a current of 10 A flows in it. The voltage across the secondary and the current in it, respectively, are

Which of the following graphs represents the correct variation of inductive reactance $X_L$ with angular frequency $\omega$ ?

In an electric circuit, a capacitor of reactance $55 \Omega$ is connected across the source of 220 V . The value of displacement current is