Hi everyone, this is my first shot at posting here. I'm looking for a way to attack this problem and needless to say i just cant figure it out. Here is the problem. A charge of +16.1 µC is located at (4.40 m, 6.02 m) , and a charge of -12.8 µC is located at (-4.50 m, 6.75 m) . What charge must be located at (2.23 m, -3.01 m) if the electric potential is to be zero at the origin? If anyone can give some thoughts on how i should proceed with this, would be greatly appreciated.