Alternating Current - Electromagnetism - Physics Previous Year Questions

Three solenoid coils of same dimensions, same number of turns and same number of layers of windings are taken. Coil 1 has inductance L₁ wounded by Mn wire of resistance 6 \(\Omega\)m^\(-\)1, coil 2 with inductance L₂ wounded by similar wire but in reverse direction in each layer. Coil 3 with inductance L₃ wounded by a superconducting wire. The relation between their self inductances will be

In the circuit shown in figure, the AC source has angular frequency \(\omega\) = 2000 rad s^\(-\)1. The amplitude of the current will be nearest to

The phasor diagram of a load represents which circuit?

A direct current of 6 A is superimposed on an alternating current I = 10 sin \(\omega\)t flowing through a wire. The effective value of the resulting current will be

In the circuit shown in the figure, the AC source gives a voltage V = 20 cos (2000t) neglecting source resistance, the voltmeter and ammeter reading will be

A resistance \(R\) and inductance \(L\) and a capacitor \(C\) all are connected in series with an \(\mathrm{AC}\) supply. The resistance of \(R\) is \(24 \mathrm{~ohm}\) and for a given frequency, the inductive reactance of \(L\) is 36 ohm and capacitive reactance of \(C\) is \(24 \mathrm{~ohm}\). If the current in the circuit is \(5 \mathrm{~amp}\). Find the potential difference across \(R, L\) and \(C\).

A direct current of \(10 \mathrm{~A}\) is superimposed on an alternating current \(i=10 \sin \omega t\) flowing through the wire. The effective value of the resulting current will be.

A pure resistive circuit element $X$, when connected to an AC supply of peak voltage 200 V , gives a peak current of 5 A . A second circuit element $Y$, when connected to the same AC supply also gives the same value of peak current but the current lags behind by $90^{\circ}$. If the series combination of $X$ and $Y$ is connected to the same supply, what will be the rms value of current?