A ring and a disk both are centered at (-6, 9, -1) and are both lying on the plane y = 9. The ring has a radius of 5 m, while the disk has a radius of 6 m, so that the ring is around the disk. Determine the magnitude of the electric field in kV/m at point (-6, -9, -1) if the ring has a total charge of -8 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 (-6, 9, -1) and are both lying on the plane y = 9. The ring has a radius of 5 m, while the disk has a radius of 6 m, so that the ring is around the disk. Determine the magnitude of the electric field in kV/m at point (-6, -9, -1) if the ring has a total charge of -8 mC and the disk has a total charge of 7 mC. All coordinates are measured in meters.