Electromagnetic...

A circular coil of diameter 21 cm is placed in a magnetic field of induction 10^-4 T. The magnitude of flux linked with coil, when the plane of coil makes an angle 30° with the field is

When a low flying aircraft passes over head, we sometimes notice a slight shaking of the picture on our TV screen. This is due to

A magnet N-S is suspended from a spring and when 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,

Two parallel rails of a railways track insulated from each other and with the ground are connected to a millivoltmeter. The distance between the rails is 1 m A train is travelling with a velocity of 72 km-h^-1 along the track. The reading of the millivoltmeter (in mV) is (Vertical component of the earth's magnetic induction is 2 × 10^-5 T)

O is the centre of two coplanar concentric circular conductors, A and B of radii r and R respectively as shown in the figure. Here, r <<< R. The mutual inductance of the system of the conductors can be given by

Three solenoid coils of same dimension, same number of turns and same number of layers of winding are taken. Coil 1 with inductance L₁ was wound using a Mn wire of resistance 11 Ωm^-1, coil 2 with inductance L₂ was wound using the similar wire but the direction of winding was reversed in each layer, coil 3 with inductance L₃ was wound using a superconducting wire. The self inductance of the coils L₁, L₂ and L₃ are

A solenoid of 1.5 m long with inner diameter of 4 cm has three layers of winding of 1000 turns each & carries a current of 2 A. The magnetic flux through a cross section of the solenoid is nearly.....

A coil has an area of 0.05 m² & it has 800 turns. It is placed perpendicularly in a magnetic field of strength, 4 x 10^–5 Wb/m^–2. It is rotated through 90^o in 0.1 sec. The average emf induced in the coil is...

A bar magnet is moving along the common axis of two coils A &B towards A. current is induced in