3. Three point charges Q1 = 32 nC, Q2 = 45 nC and Q3 = −11 nC are in vacuum and are located along one straight line. If the distance a = 7.6 cm, then what is the potential energy W of the electrostatic interaction of the system of these charges.

Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)