19. At a distance r1 = 4 cm from the infinitely long charged wire is a point charge 2 • 10-6 Cl. Under the influence of the field charge moves through the power line to a point located at a distance r2 = 2 cm from the filament. This work is performed 0.5 J. Find the linear charge density of the yarn.

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