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clear//
//Variables
l = 0.2 * 10**-3 //length (in meter)
A = 0.04 * 10**-6 //Area of cross section (in square-meter)
V = 1 //Voltage (in volts)
I = 8 * 10**-3 //current (in Ampere)
un = 0.13 //mobility of electron (in m**2 per volt-second)
q = 1.6 * 10**-19 //charge on electron (in Coulomb)
//Calculation
R = V/I //Resistance (in ohm)
p = R * A/l //Resistivity (in ohm-meter)
sig = 1/p //Conductivity (in siemen per meter)
n = sig / (q * un) //concentration (in per cubic-meter)
J = I/A //current density (in Ampere per square-meter)
v = J/(n*q)
//Result
printf("\n Concentration of free electrons is %e m**-3.\nDrift velocity is %0.3f m/s.",n,v)
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