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 long straight solenoid of cross-sectional diameter d = 5 cm and with n = 20 turns per one cm of its length has a round turn of copper wire of cross-sectional area S = 1.0 mm^(2) tightly put on its winding. Find the current flowing in the turn if the current in the solenoid winding is increased with a constant velocity dotI = 100 A//s . The inductance of the turn is to be neglected.

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.

The magnetic field intensity inside a long solenoid is 1T. If the current per turn of the solenoid winding is 1A, find the number of turns in per meter.

In a long staright solenoid with cross-sectional radius a and number of turns per unit length n a current varies with a constant velocity dotI A//s . Find the magntidue of the eddy current field strength as a function of the distance r from the solenoid axis. Draw the appoximate plot of this function.

The current density is defined as the current flowing per unit area of cross section of the conductor. Its direction is

A long solcnoid of length 1m, cross-sectional area 10cm^(2) , having 1000 turns has wound about its centre a small coil of 20 turns. Compute the mutual inductance of the pair of solenoid and the coil . What is the induced EMF in the coil when the current in the solenoid changes at the rate of 10 A//s ?

Derive the expression for the self inductance of a long solenoid of cross sectional area A and length l, having n turns per unit length.

A very long straight solenoid carries a current i . The cross-sectional area of the solenoid is equal to S , the number of turns per unit length is equal to n . Find the flux of the vector B through the end plane of the solenoid.