Solution to task 344 from Chertov´s for extramural stud

Solution to task 344 from Chertov´s for extramural stud

344. An electron with energy T = 400 eV (at infinity) moves along the line of force towards the surface of a charged metal sphere with a radius of R = 10 cm. Determine the minimum distance that an electron will approach the surface of the sphere if its charge Q = - 10 nC ...