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+//Book Name:Fundamentals of Electrical Engineering
+//Author:Rajendra Prasad
+//Publisher: PHI Learning Private Limited
+//Edition:Third ,2014
+
+//Ex4_26.sce.
+
+clc;
+clear;
+d_i=5e-3;             //Diameter of inner cylinder in metre
+d_o=15e-3;            //Diameter of outer cylinder in metre
+epsilon_r=4;
+V=500;
+epsilon_not=8.854e-12;
+epsilon=epsilon_r*epsilon_not;
+a=d_i/2;
+b=d_o/2;
+C=(2*%pi*epsilon)/(log(b/a));
+printf("\n Capacitance of the cable=%3.2f pF/m \n",C*1e12)
+
+printf("\n(a)")
+p_l=C*V;                //Electric displacement through a cylindrical area of unit length in C/m
+D=p_l/(2*%pi*a);
+E=D/epsilon;
+printf("\n  The electric flux density at the surface of inner conductor=%1.3f micro_C/m^2",D*1e6)
+printf("\n  The electric field intensity at the surface of inner conductor=%3.0f kV/m \n",E*1e-3)
+
+printf("\n(b)")
+D=p_l/(2*%pi*b);
+E=D/epsilon;
+printf("\n  The electric flux density at the inner surface of outer conductor=%1.3f micro_C/m^2",D*1e6)
+printf("\n  The electric field intensity at the inner surface of outer conductor=%2.3f kV/m \n",E*1e-3)
+//Answer vary dueto round off error