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+//Problem 40.02: A field plot for a cross-section of a concentric cable is shown in Figure 40.10. If the relative permeability of the dielectric is 3.4, determine the capacitance of a 100 m length of the cable.
+
+//initializing the variables:
+e0 = 8.85E-12; 
+er = 3.4;
+l = 100; // in m
+
+//calculation: 
+//From Figure 40.10
+m = 13; // number of parallel squares measured along each equipotential
+n = 4; // the number of series squares measured along each line of force
+C = e0*er*l*m/n
+
+printf("\n\n Result \n\n")
+printf("\n capacitance is %.3E Farad.",C)
+\ No newline at end of file