Answer the following questions:
(b) What is so special about the combination e/m? Why do we not simply talk of e and m separately?

Explanation

Both the basic relations `e V = (1//2) m v^(2) or e E = m a and e B v =m v^(2)//r`, for electric and magnetic fields, respectively, show that the dynamics of electrons is determined not by e, and m separately but by the combination e/m.