Решение задачи по физике раздел 72 пункт 92 электро

92. At what distance r2 from a point charge is the electric field strength of this charge in a liquid dielectric with a permittivity ε2 = 81 (water) the same as at a distance r1 = 9 cm from this charge in air?

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