Electromagnetic...

A 50 volt potential difference is suddenly applied to a coil with L = 5 ×10^–3henry and R = 180 ohm. The rate of increase of current after 0.001 second is

A conducting ring of radius 1 meter is placed in an uniform magnetic field B of 0.01 tesla oscillating with frequency 100 Hz with its plane at right angles to B.What will be the induced electric field?

A 16 μF capacitor is charged to a 20 volt potential. The battery is then disconnected and pure 40 mH coil is connected across the capacitor, so that LC oscillations are setup. The maximum current in the coil is

In an oscillation of L–C circuit, the maximum charge on the capacitor is Q. The charge on the capacitor, when the energy is stored equally between the electric andmagnetic field is

Two concentric coils each of radius equal to 2 π cm are placed at right angles to each other. 3 A and 4 A are the currents flowing in each coil respectively. The magnetic induction in Wb/m² at the centre of the coils will be(µ₀ = 4 π× 10^–7 Wb/Am)

A conducting circular loop is placed in a uniform magnetic field, B = 0.025 T with its plane perpendicular to the loop. The radius of the loop is made to shrink at a constant rate of 1 mms^–1. The induced e.m.f. whenradius is 2 cm, is

The current through a 4.6 H inductor is shown in the following graph. The induced e.m.f. during the time interval t = 5 milli-sec to 6 milli-sec will be

An alternating current of frequency 200 rad/sec and peak value 1 A as shown in the figure, is applied to the primary of a transformer. If the coefficient of mutual induction between the primary and the secondary is 1.5 H, the voltage induced in the secondary will be

A horizontal loop abcd is moved across the pole pieces of a magnet as shown in fig. with a constant speed v. When the edge ab of the loop enters the pole pieces at time t = 0 sec, which one of the following graphs represents correctly the induced e.m.f. in the coil

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 figure. The magnitude of change in flux through the coil in webers is