Alternating Cur...

The network shown in Fig is part of a complete circuit. If at a certain instant, the current I is 5 A, and is decreasing at a rate 10³A/s, then (V_B-V_A) is

In the circuit shown in Fig switch S is closed at time t = 0. The charge which passes through the battery in one time constant is

In an L-R circuit connected to a battery, the rate at which energy is stored in the inductor is plotted against time during the growth of current in the circuit. Which of the following best represents the resulting curve?

In the circuit shown in Fig the coil has inductance and resistance. When X is joined to Y, the time constant is τ during growth of current when the steady state is reached, heat is produced in the coil at a rate P. X is now joined to Z.

A conducting rod PQ of length L = 1.0 m is moving with a uniform speed ν = 2.0 m/s in a uniform magnetic field B = 4.0 T directed into the paper. A capacitor of capacity C=10 μF is connected as shown in Fig . Then

Some magnetic flux is changed from a coil of resistance 10 ohm. As a result, an induced current is developed in it, which varies with time as shown in Fig. The magnitude of change in flux through the coil in weber is

Two concentric and coplanar circular coils have radii a and b as shown in Fig. Resistance of the inner coil is R current in the other coil is increased from 0 to i, then the total charge circulating the inner coil is

The radius of the circular conducting loop shown in Fig is R. Magnetic field is decreasing at a constant rate α. Resistance per unit length of the loop is ρ. Then current in wire AB is (AB is one of the diameters)

In the circuit shown in Fig the jockey J is being pulled towards right so that the resistance in the circuit is increasing. Its value at some instant is 5Ω. The current in the circuit at this instant will be

The power is transmitted from a power house on high voltage ac because