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+// Chapter 4_Carrier Transport Phenomenon
+//Caption_Conductivity
+//Ex_2//page 144
+T=300
+Nd=5*(10^15)    //donor concentration
+R=10   //resistance in kohm
+J=50    //current density in A/cm^2
+V=5   //voltage  in volts
+i=V/R    //current
+A=i/J    //cross sectional area
+E=100
+L=V/E   //length of the resistor
+pho=L/(V*A)
+// The conductivity of a compensated p-type semiconductor is
+//pho=e*muP*(Na-Nd)
+//where the mobilty is a function of the total ionized impurity concentration Na+Nd
+//Using trial and error , if
+ Na=1.25*(10^16)
+ muP=410
+ e=1.6*(10^-19)
+sig=e*muP*(Na-Nd)
+printf('Conductivity obtained is %1.2fd which is very close to the value we need',sig)
+\ No newline at end of file