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+//Example 10// Ch 12
+clc;
+clear;
+close;
+// given data
+a=1;//inner thickness of cable in cm
+epsilonr1=4.5;
+epsilonr2=3.6;
+r1=2;//in cm
+b=2.65;//in cm
+V=53.8;//in kV
+Emax1=V/(a*[log(r1)+(epsilonr1/epsilonr2)*log(1.325)]);
+printf("max stress in rubber %f kV/cm",Emax1)
+Emax2=V/(r1*[((epsilonr2/epsilonr1)*log(r1))+ log(1.325)]);
+printf("max stress in paper %f kV/cm",Emax2)
+
+
+