In copper the number of free electrons per `m^(3) is `8.4 x 10^(28). Calculate the drift velocity of electrons in a copper wire of cross sectional area `2 x 10^(-6)m^(2), if a current of 0.63A is flowing through it.

A copper wire of cross-sectional area 2mm^(2) resistivity =1.7 xx 10^(-8)Omega m , carries a current of 1A. The electricfield in the copper wire is

A current 10 A is maintained in a conductor of cross section 10^(-4)m^(2) . If the number density of free electrons be 9 xx 10^(28) m^(-3) . Calculate the drift velocity of free electrons. ( e = 1.6 x 10^(-19)C)

A steel wire of length 4.7m and cross sectional area 2xx10^-5m^2 stretches by the same amount as a copper wire of length 3.5m and cross sectional area of 4xx10^-5m^2 under a given load. What is the ratio of the Young's modulus of steel to that of copper?