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+//Book Name:Fundamentals of Electrical Engineering
+//Author:Rajendra Prasad
+//Publisher: PHI Learning Private Limited
+//Edition:Third ,2014
+
+//Ex4_16.sce.
+
+clc;
+clear;
+q1=-2e-9;
+q2=3e-9;
+q3=2e-9;
+q4=1e-9;
+AB=1;              //Given square side as 1 metre
+BC=1;
+epsilon_not=8.854e-12;
+AP=sqrt(AB^2+BC^2)/2;             //formula derived from the figure
+Vp=(1/(4*%pi*epsilon_not*AP))*(q1+q2+q3+q4);
+printf("\n Potential at the centre of the square=%2.2f volt",Vp)
+
+//Answer vary due to roundoff error