Question

Figure shows the variation of inductive reactance X_L of two ideal inductors of inductance L₁ and L₂, with angular frequency ω. The value of L₁/L₂ is

A coil of resistance 20 Ω and self-inductance 10 mH is connected to an ac source of frequency 1000/π Hz. The phase difference between current in the circuit and the source voltage is :

An inductor, a capacitor and a resistor are connected in series across an ac source of voltage. If the frequency of the source is decreased gradually, the reactance of :

The figure shows variation of current (I) with time (t) in four devices P, Q, R and S. The device in which an alternating current flows is :