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+//chapter 1
+//example 1.3
+//calculate potential energy
+//page 15
+clear;
+clc;
+//given
+r=2; //in angstrom(distance)
+e=1.6E-19; // in C (charge of electron)
+E_o= 8.85E-12;// absolute premittivity
+//calculate
+r=2*1E-10; // since r is in angstrom
+V=-e^2/(4*%pi*E_o*r); // calculate potential
+printf('\nThe potential energy is \tV=%3.3E J',V);
+V=V/e; // changing to eV
+printf('\nIn electron-Volt,\tV=%.2f eV',V); 
+// Note: the answer in the book is wrong due to calculation mistake