This hmwk. problem has got me totally buggin... A uniformly charged insulating rod of length 20cm is bent into the shape of a semicircle (so it looks like the letter "C"). The rod has a total charge of -8.50e-6C. Find the electric potential at a point P, in the center of the semicircle. I know crazy things happen to electric potential when dealing with insulators...also, will this problem involve integrals? If anyone has a clue I'd appreciate the guidance! Thanks in advance!