A long solenoid of cross-sectional radius `a` has a thin insulates wiere ring tightly put on its winding, one half of the ring has the resistance `eta` times that of the other half. The magneticv induction produced by the solenoid varies with the time as `B = bt`, where `b` is a constant. Find the magnitude of the electric field strength in the ring.

In the middle of a long solenoid there is a coaxial ring of square cross-seciton, made of conducting materaial with respectivity are equal to h its inside and outside radii are equal to a and b respectively. Find the current induced in the ring if the magnetic induction produced by the solenoid varies with time as B = beta t , where beta t , where beta is constant. THe inductance of the ring is to be neglected.

A long solenoid has 800 turns per metre length of solenoid A current of 1.6 A flow through it. The magnetic induction at the end of the solenoid on its axis is

A long solenoid has 800 turns per metre length of solenoid A currentof 1.6 A flow through it. The magnetic induction at the end of the solenoid on its axis is

The magnetic induction at the centre of a solenoid is B . If the length of the solenoid is reduced to half and the same wire is would in two layers the new magnetic induction is

The magnetic induction at the centre of a solenoid is B . If the length of the solenoid is reduced to half and the same wire is would in two layers the new magnetic induction is

A long straight solenoid of cross-sectional diameter d and with n turns per unit of its length has a round turn of copper wire of cross-sectional area A and density rho is tightly put on its winding. Find the current flowing in the turn if the current in the solenoid winding is increased with a constant rate I ampere per second.

A very long straight solenoid has a cross section radius R . A number of turns per unit length is equal to n . Find the magnetic induction at the centre of the coil when a current I flows thougth it.