10. The distance d between the point charges Q1 = 3 nC and Q2 = 5 nC in vacuum is 35 cm. Determine the strength of the electrostatic field at point A, which is at a distance r1 = 25 cm from the first charge and at a distance r2 = 20 cm from the second charge.

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