1. The problem statement, all variables and given/known data There's a charged semicircle, the ends of which are on the x-axis and it extends into the positive y-axis. It has uniform line charge density. I need to find the electric field at an arbitrary point on the x-axis that's not the origin. 2. Relevant equations I don't know. 3. The attempt at a solution I don't even know where to start. Even just starting me off would be much appreciated.