The solution of the problem 2.15 cr 2 from the problem

The solution of the problem 2.15 cr 2 from the problem

Task 2.15
The charge of 1 nC is transferred from infinity to a point located at a distance of 0.1 m from the surface
A metal sphere with a radius of 0.1 m, charged with a surface density of 10-5 cells / m2. Identify
Work of charge transfer.