2. The metal ring was torn apart by Coulomb forces when the charge of the ring was Q. We made exactly the same new ring, but from a material whose strength is 10 times greater. What charge will tear a new ring? What charge will tear a new ring made of the old material, if all the dimensions of the new ring are 3 times the size of the old?

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