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+//Book Name:Fundamentals of Electrical Engineering
+//Author:Rajendra Prasad
+//Publisher: PHI Learning Private Limited
+//Edition:Third ,2014
+
+//Ex4_5.sce.
+
+clc;
+clear;
+//from the given figure
+q=1e-8;
+OB=sqrt(5^2-4^2); //Distance between point O and B
+cos_theta=3/5;
+sin_theta=4/5;
+r=5e-2;
+
+epsilon_not=1/(36e9*%pi);
+modulus_E=q/(4*%pi*epsilon_not*r^2);
+E1=((modulus_E*cos_theta)-(modulus_E*sin_theta*%i));
+E2=((-modulus_E*cos_theta)-(modulus_E*sin_theta*%i));
+E=E1+E2;
+disp(E,'The resultant field intensity in N/C is')
+
+
+