Alternating Cur...

An inductance L having a resistance R is connected to an alternating source of angular frequency ω. The quality factor (Q) of the inductance is

A uniform but time varying magnetic field B (t) exists in a circular region of radius a and is directed into the plane of the paper as shown. The magnitude of indudced electric field at point P at a distance r from the centre of the circular region is

A wind powered generator converts wind energy into electrical energy. Assume that the generator converts a fixed fraction of the wind energy intercepted by its blades into electric energy. For wind speed v, the electric power output will be proportional to

Two circular coils can be arranged in any of the three situations shown in fig. their mutual inductance will be

The current flowing in a step down transformer 220 V to 22 V having impedance 220Ω is

A capacitor of capacity C has reactance X.If capacitance and frequency become double, then reactance will be

The power factor of an a.c. circuit having resistance R and inductance L connected in series to an a.c. source of angular frequency ω is

A coil having 500 square loops of side 10cm is placed normal to magnetic field which increases at a rate of 1 T/sec. The induced e.m.f is

Power delivered by the source in the circuit is maximum, when

An inductor L and a capacitor C are connected in the circuit as shown in fig. The frequency of power supply is equal to the resonance frequency of the circuit. Which ammeter will read zero ampere?