14. In water, at a distance of 5 cm from each other, point charges of 20 and −10 μC are placed. Determine the electric field strength at a point located at a distance of 4 cm from the first charge and at a distance of 3 cm from another. What force acts at this point on a point charge of 1 μC?

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