Решение задачи по физике раздел 74 пункт 21 электро

21. What is the dielectric constant ε of the medium equal to if the modulus of the electrostatic field strength is E = 20 kV / m at a distance r = 2 cm from the point charge q = 4 nC?

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