A ring and a disk both are centered at (2, 9, 0) and are both lying on the plane y = 9. The ring has a radius of 6 m, while the disk has a radius of 7 m, so that the ring is around the disk. Determine the magnitude of the electric field in kV/m at point (2, -8, 0) if the ring has a total charge of -7 mC and the disk has a total charge of 7 mC. All coordinates are measured in meters.

A ring and a disk both are centered at (2, 9, 0) and are both lying on the plane y = 9. The ring has a radius of 6 m, while the disk has a radius of 7 m, so that the ring is around the disk. Determine the magnitude of the electric field in kV/m at point (2, -8, 0) if the ring has a total charge of -7 mC and the disk has a total charge of 7 mC. All coordinates are measured in meters.