Alternating current Questions

A coil has an inductance of 0.7 henry and is joined in series with a resistance of 220Ω. When the alternating emf of 220V at 50 Hz is applied to it then the phase through which current lags behind the applied emf and the wattless component of current

A solenoid of length 0.5 m has a radius of 0.1cm and is made up of 500 turns. It carries a current of 5A The magnitude of magnetic field inside the solenoid is :-

The principle of working of transformer is

The r.m.s value of potential difference V shown in the figure is

Two coils of self inductance L₁ and L₂ are placed near each other so that the total flux in one coil is completely linked with the other. Their mutual inductance (M) will be given by

An open vessel having square base of side length 2 m and height 1 m, is filled with a liquid completely and is accelerated with acceleration a as shown in the figure. The minimum value of ‘a’ so that pressure at midpoint of AC is equal to the atmosph

In the circuit shown in figure, if source resistance is neglected, then the voltmeter and ammeter readings will, respectively, be

A transformer consisting of 300 turns in the primary and 150 turns in the secondary gives output power of 2.2 kW. If the current in the secondary coil is 10 A, then the input voltage and current in the primary coil are :

When the current changes from +2A to −2A in 0.05 second, an e.m.f. of 8V is induced in a coil. The coefficient of self-induction of the coil is –

Switch is in position A for long time. At time t = 0 it is shifted to position B. Find the maximum charge on capacitor.

An ideal transformer connected to a 200 V AC supply has 1000 turns in its primary coil and 50 turns in its secondary coil. If a purely resistive load of 2Ω is connected across the secondary coil, match the electrical quantities in List-I with their c