Because if you pick any point along it, and we're looking at a side view, but if we took a top view, if that's the top view and, of course, the plate goes off in every direction forever and that's kind of where our point charge is, if we said, oh, well, you know, there's this point on the plate and it's going to have some y-component that's on this top view coming out of the video, but it'll have some x-component, this point's x-component effect will cancel it out. 