Vent

I'm working on a problem dealing with the voltage of a uniformly charged ring. Now I'm essentially certain that the total charge is going to easily determined by the formula V = (1/[4*pi*epsilon Zero]) * (Charge/distance) when I know that V=400 at the center of the ring. I know this because I've figured out the trick that allows you to treat it in much the same way as a point charge, a trick which is allowed because V is a scalar not a vector. I typed in my awnser, It's wrong. I spend 20 minutes trying to figure out in the name of all that is holy why?. So it turns out the awnser wasn't 7.117-9 It was 7.117e-9. I assure you something is going to be destroyed over this.