A wire having a diameter of 3mm is streached by external force to produce a longitudinal strain of `3xx10^-3` . What will be the change in diameter if the poisson's ratio of the wire is 0.4.

If there is no change in the volume of a wire due to change in it's length on stretching , what would be the poisson's ratio of the material.

A force of 100 N produces a change of 0.01% in a length of wire of area of cross -section 1.0 mm^2 . Young's modulus of the wire is

An infinite charged wire produces a dield of 18xx10^(4) N/C at a distance of 1 m. Calculate the linear charge density of the wire.

Two wires have diameters in the ratio 1:2 , length in the ratio 3:4 and young's moduli in the ratio 2:3. What is the ratio of elongations produced in the wires if they are subjected to the same streching force ?