11. The distance between two point charges located in a vacuum is d = 18 cm. Determine the field strength at point A, remote from the first charge by a distance of r1 = 15 cm and from the second by r2 = 10 cm. Q1 = –3 nC, Q2 = 4 nC.

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