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+//Example 4_13
+clc;
+clear;
+close;
+format('v',9)
+//given data : 
+n0=7.87*10^28;//m^-3
+mu=35.2;//cm^2/vs
+E0=30*10^2;//V/m
+h=1.05*10^-34;//Js//Planks Constant
+e=1.6*10^-19;//C///Charge on electron
+//Part (a)
+sigma=n0*e*mu*10^-4;//s/m
+disp(sigma,"(a) Conductivity(s/m)");
+//Part (b)
+V0=E0*mu*10^-4;//m/s
+disp(V0,"(b) Drift velocity of electron(m/s)");
+J=sigma*E0;//A/m^3
+disp(J,"(b) Current density(A/m^3)")
+//Answer given in the textbook is not accurate.