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+//chapter 6
+//example 6.9
+//Calculate average drift velocity of electrons
+//page 149
+clear;
+clc;
+//given
+I=4; // in A (current in the conductor)
+e=1.6E-19; // in C (charge of electron)
+A=1E-6; // in m^2 (cross-sectional area)
+N_A=6.02E23; // in atoms/gram-atom (Avogadro's number)
+p=8.9; // in g/cm^3 (density)
+M=63.6; // atomic mass of copper
+//calculate
+n=N_A*p/M; // Calculation of density of electrons in g/cm^3
+printf('\nThe density of copper atoms is \tn=%1.2E atoms/m^3',n);
+n=n*1E6; // changing unit from g/cm^3 to g/m^3
+printf('\n\t\t\t\t =%1.2E atoms/m^3',n);
+v_d=I/(n*A*e);
+printf('\n\nThe average drift velocity of free electrons is \tv_d=%1.1E m/s',v_d);