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+//Example 18.3
+q=-0.250*10^-6;//Charge (C)
+E=7.20*10^5;//Electric field strength, See Example 18.2 (N/C)
+F=-q*E;//Force (N)
+printf('Force on the charge = %0.3f N',F)
+if q<0
+    printf('\nDirection of force is opposite to direction of field')
+else
+    printf('\nDirection of force is the same as the direction of field')
+end
+//Openstax - College Physics
+//Download for free at http://cnx.org/content/col11406/latest