Lithium has atomic number 3 and mass number 6, and there are no electrons in the nucleus just protons and neutrons. A represent 45 degrees from the horizontal and vertical. The centers of the spheres are initially separated by a distance L . The two spheres are brought together so that they care in contact. The spheres are then returned to twice their original separation L .
Gravity is irrelevant.
You must show your work. You can sketch you answer directly on the figure. You need not solve any equations for x and y. Too lazy - the electron curves sharply toward the positive plate and the proton bends more gently down. Find the amount of charge on the upper plate.