Two ions are placed between the plates: the fluoride ... ...

   Two ions are placed between the plates: the fluoride ion 20F and the bromide ion 80Br. The former experiences a force of magnitude FF, and the latter a force of magnitude FBr. How do these compare?
(A) FBr = FF
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in 16. Atomic and Nuclear Physics