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+//Example 15_2
+clc();
+clear;
+//To find the force on the center charge
+k=9*10^9    //Units in N meter^2/C^2
+q1=4*10^-6    //Units in C
+q2=5*10^-6   //Units in C
+r1=2         //Units in meters
+r2=4     //Units in meters
+q3=6*10^-6     //Units in C
+f1=(k*q1*q2)/r1^2       //Units in N
+f2=(k*q2*q3)/r2^2       //Units in N
+f=f1-f2       //Units in C
+printf("The force on the center charge is=%.5f N",f)