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+// Compute conductivity,drift velocity,current density

+// Basic Electronics

+// By Debashis De

+// First Edition, 2010

+// Dorling Kindersley Pvt. Ltd. India

+// Example 1-13 in page 47

+

+clear; clc; close;

+

+// Data given

+mu=35.2*10^-4; // Mobility of electrons in m^2/Vs

+n_0=7.87*10^28; // Number of free electrons per cubic meter

+e=1.6*10^-19; // Charge on an electron in C

+E_0=30*10^2; // External electric field applied in V/m

+

+// Calculation

+sigma=n_0*e*mu;

+printf("(a)Mobility = %0.1e m^2/Vs\n",mu);

+printf("Conductivity of the specimen is %0.2e s/m\n\n",sigma);

+V_0=mu*E_0;

+J=sigma*E_0;

+printf("(b)Electric field Eo = %0.0e V/m\n",E_0);

+printf("Drift velocity of free electrons is %0.2f m/s\n",V_0);

+printf("Current density is %0.2e A/meter^3",J);

+

+// Result

+// (a) Conductivity of specimen is 4.43*10^7 s/m

+// (b) Drift velocity of free electrons is 10.56 m/s

+// (c) Current density is 13.3*10^10 A/meter cube
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+(a)Mobility = 3.5e-003 m^2/Vs

+Conductivity of the specimen is 4.43e+007 s/m

+

+(b)Electric field Eo = 3e+003 V/m

+Drift velocity of free electrons is 10.56 m/s

+Current density is 1.33e+011 A/meter^3 
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