A positive charge is subjected to a force $F$ when it is at point X in a uniform electric field. The charge is then transferred from point X to point Y. The diagram shows distances $r$ and $s$. What is the change in the potential energy of the charge?
- Adecreases by $F s$
- Bincreases by $F s$
- Cdecreases by $F r$
- Dincreases by $F r$