11. The electric field is created by two point charges Q1 = 40 nC and Q2 = –10 nC, located at a distance d = 10 cm from each other. Determine the field strength E at a point remote from the first charge by r1 = 12 cm and from the second by r2 = 6 cm.

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