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+// Example 9.20;//thickness
+clc;
+clear;
+close;
+A=1.5;//area in mili meter square
+R=100;//resistance in ohms
+Eo=1.04*10^-10;//F/m
+Vd=10^7;//DRIFT VELOCITY IN m/s
+w=round((sqrt(R*Eo*A*10^-6*Vd))*10^6);//thickness in micro meters
+disp(w,"thickness in micro meters is")