Along the axis of a uniformly charged disk, at a point 0.6 m from the center of the disk, the potential is 91.4 V and the magnitude of the electric field is 86.5 V/m; at a distance of 1.5 m, the potential is 46.8 V and the magnitude of the electric field is 27.0 V/m. Find the total charge residing on the disk. I have both equation to finding the electric field and potential field for a uniform disk. There are two unknowns in the equation they are R and σ. Are they giving too much information?