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//Example number 9.13, Page number 208
clc;clear;
close;
//Variable declaration
sigmae=2.2*10**-4; //conductivity(ohm/m)
mew_e=125*10**-3; //electron mobility(m**2/Vs)
e=1.602*10**-19; //charge(c)
//Calculation
ne=sigmae/(e*mew_e); //concentration(per m**3)
//Result
printf("concentration is %.1e per m^3",ne)
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