22. On a ring of radius R = 10 cm from a thin wire, the charge Q = 10 nC is evenly distributed. Determine: 1) the potential φ0 of the electrostatic field in the center of the ring; 2) the potential φ of the electrostatic field on the axis passing through the center of the ring, at a point at a distance l = 15 cm from the center of the ring.

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