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+//Exa2.8
+clc;
+clear;
+close;
+//given data :
+//Diameter of copper wire
+d=2;//in milimeter
+d=.002;//in meter
+//conductivity of copper
+nita=5.8*10^7;//in second per meter
+//Electron mobility
+miu_e=.0032;//in meter square per volt-second
+//Applied electric field
+E=20;//in mV/m
+E=.02; //in V/m
+e=1.6*10^-19;
+//(i) From eq. (2.13)
+//charge density
+n=nita/(e*miu_e);//in per meter cube
+disp("(i) Charge density is : "+string(n)+" /meter cube");
+//(ii) from eq. (2.9)
+//current density
+J=nita*E;// in A/m^2
+disp("(ii) Current density is : "+string(J)+" A/m^2");
+//(iii) Current flowing in the wire I=J* Area of x-section of wire
+// Area of x-section of wire= (%pi*d^2)/4
+I=(J*%pi*d^2)/4;
+disp("(iii) Current flowing in the wire is : "+string(I)+" A");
+//(iv) form eq.2.14
+//Electron drift velocity
+v=miu_e*E;
+disp("(iv) Electron drift velocity is :"+string(v)+" m/s");