The inductance `L` of a solenoid of length `l`, whose windings are made of material of density `D` and resistivity `rho`, is (the winding resistance is`R`)

Find the inductance of a solenoid of length l whose winding is made of copper wire of mass m . The winding resistance is equal to R . The solenoid diameter is considerably less than its length.

Calculate the inductance of a closely wound solenoid of length l whose winding is made of copper wire of mass m. The winding has a total resistance equal to R. The solenoid diameter is considerably less than its length. .

A tapered bar of length L and end diameters D_(1) and D_(2) is made of a material of electrical resistivity rho . The electrical resistance of the bar is

A solid cylinder of length l and cross-sectional area A is made of a material whose resistivity depends on the distance r from the axis of the cylinder as rho = k//r^(2) where k is constant . The resistance of the cylinder is -

The length of a wire required to make a solenoid of length l and self - induction L is

A current i passes through a wire of length l , radius of cross-section r and resistivity rho . The rate of heat generation is