There are two problems I'm struggling with currently.

1) Consider two thin charged rods in the shape of a circle centered at the origin in the XY-Plane. Let -q be the charge on the upper half of the circle, and q be the charge on the lower half. |q| = 20.5 nC. If the radius of the ring is given to be 10.0cm, find the magnitude and direction of the electric field at Point P located at the origin (Center of Circle).

2) A circular plastic disk has a charge q= 2.00×10^6C uniformly distributed over its surface. The radius of the full disc is R=2.00cm. Find the charge contained within a thin ring of radius r=.500cm and width 30.0micrometers, centered on the surface of the plastic disc.

There is no picture or anything provided, it's just these two questions. Good luck to anyone who tries.