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+//Example 5// Ch 5
+clc;
+clear;
+close;
+// given data
+d=0.001;
+a = 0.1*10^-2;//radii of concentric circle in meters
+b = 2.1*10^-2;//radii of concentric circle in meters
+p = 101.3;//gas pressure in kPa
+p1=3*p;
+p2=5*p;
+C =  -2400.4;//constant value
+A = 0.027;//constant value
+As = 10^8;//avalanche size
+ri = 0.0772;//in m
+V0 = [log(10^8)-{(C*p)*(ri-a)}]*(b-a)/[A*{(1/a)-(1/ri)}];
+printf("corona onset voltage is %f kV \n",V0)
+V0pos = 13.1;//in kV
+V0neg = 13.7;//in kV
+printf("positive corona onset voltage %f kV \n",V0pos)
+printf("negative corona onset voltage %f kV \n",V0neg)
+
+//acc. to eq N2>=N1 and Neph>=1 with increase of gas pressure improves the dielectric strength of the gas since breakdown voltage increses with gas pressure