1. The problem statement, all variables and given/known data A charge of -5.00 nC is spread uniformly over the surface of one face of a nonconducting disk of radius 1.15 cm. Find the magnitude of the electric field this disk produces at a point P on the axis of the disk a distance of 3.00 cm from its center. 2. Relevant equations Surface area element for a disk [sigma]= Q / A See attachments 3. The attempt at a solution So I plugged the numbers in accordingly, had no luck. I appreciate the help.