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+//Example  7.1// width and length
+clc;
+clear;
+close;
+format('v',6)
+vph=400;//phase voltage in volts
+n=3;//number of phase
+kw=36;//power in kW
+r=((vph^2)/(n*((kw*10^3)/n)));//resistance in ohms
+p=1.016*10^-6;//resitivity
+t=0.3;//thickness in mm
+x=(((r*t*10^-3)/(p)));//variable
+t1=1000;//initial temperature in degree celsius
+t1k=273+t1;//initial temperature in kelvin
+t2=650;//final temperature in degree celsius
+t2k=273+t2;//final temperature in kelvin
+h=((3*10^4)*((t1k/1000)^4-(t2k/1000)^4));//W/m^2
+y=((kw*10^3)/(3*2*h));//variable
+l=sqrt(x*y);//length in meter
+w=y/l;//width in meter
+disp(l,"length is,(m)=")
+disp(w*10^3,"width is,(mm)=")