clear;
clc;
printf("\nEx-6.13\n");
//page no.-190
//given
A=10^-6;.......//cross-sectional area in m^2
I=1;..........//current in Ampere
n0=8.5*10^28;.........//no. of electrons per unit vol
e=1.6*10^-19;......//charge in C

v=I/(no*A*e)...........//drift velocity in m/s

printf("\ndrift velocity of free e is7.4*10^-4 m/s");