Density of electron is X ×`10^(12)`g/ml then "x" is ..(where radius of electron is 4.28×`10^(-14)`mm

Density of electron is X times10^(12)(g)/(ml) then "x" is ..(where radius of electron is 4.28times10^(-14)

A current of 16 A is made to pass through a conductor in which the number of density of free electrons is 4xx10^(28)m^(-3) and its area of cross section is 10^(-5)m^(2) . The average drift cross section is 10^(-5)m^(2) . The average drift velocity of free electrons in the conductor is

If the mass of an electron is 9 xx 10^(-28) grams weight of one mole of electron is

If in a conductor number density of electrons is 8.5xx10^(28) average relaxation time 25 femtosecond mass of electron being 9.1xx10^(-31) kg, the resistivity would be of the order.

6. ^(*) The current in a metal wire of cross-sectional area 10^(-6)m^(2) is 1.6A .If the free electron density of the metal is 8times x^(2) x 10^(28)m^(-3) then the drift speed of electrons is (A) 1.25times10^(-3)ms^(-1) (B) 2times10^(-3)ms^(-1) (C) 1.25times10^(-4)ms^(-1) (D) 2times10^(-4)ms^(-1)

A copper wire has a square cross-section, 2.0 mm on a side. It carries a current of 8 A and the density of free electrons is 8 xx 10^(28)m^(-3) . The drift speed of electrons is equal to