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+//Example 18.2
+Q=2.00*10^-9;//Charge (C)
+k=8.99*10^9;//Coulomb's constant (N.m^2/C^2)
+r=5*10^-3;//Distance (m)
+E=k*Q/r^2;//Electric field strength (N/C)
+printf('Electric field strength = %0.2e N/C',E)
+if E>0
+    printf('\nDirection of electric field points away from the charge')
+else
+    printf('\nDirection of electric field points towards the charge')
+end
+//Openstax - College Physics
+//Download for free at http://cnx.org/content/col11406/latest