Electromagnetic...

When a bar magnet falls through a long hollow metal cylinder fixed with its axis vertical, the final acceleration of the magnet is

A magnet NS is suspended from a spring and while it oscillates, the magnet moves in and out of the coil C. The coil is connected to a galvanometer G. Then as the magnet oscillates,

A coil having n turns and resistance R Ω is connected with a galvanometer of resistance 4 R Ω This combination is moved in time t seconds from a magnetic field W₁ weber to W₂ weber. The induced current in the circuit is

A square loop of side 22 cm is converted into circular loop in 0.4 s. A uniform magnetic field of 0.2 T directed normal to the loop then the e.m.f. induced in the loop is

If a coil of 40 turns and area 4.0 cm² is suddenly removed from a magnetic field, it is observed that a charge of 2.0 × 10^–4 C flows into the coil. If the resistance of the coil is 80 Ω, the magnetic flux density in Wb/m² is

In an AC generator, a coil with N turns, all of the same area A and total resistance R, rotates with frequency ω in a magnetic field B. The maximum value of e.m.f. generated in the coil is

The diagram below shows two coils A and B placed parallel to each other at a very small distance. Coil A is connected to an ac supply. G is a very sensitive galvanometer. When the key is closed

An infinitely long cylinder is kept parallel to a uniform magnetic field B directed along positive z–axis. The direction of induced current as seen from the z axis will be

The magnetic flux across a loop of resistance 10 Ω is given by ɸ = 5t² – 4t + 1 weber. How much current is induced in the loop after 0.2 sec?