The figure аbоve shоws а thin, circulаr nоnconducting sheet of positive charge uniformly distributed over its area. The radius of the sheet is . Point O is at the center of the sheet. Point S is a distance from the center of the sheet, and point T is a distance from the center of the sheet. Assume if the magnitude of the electric field at point T is , which of the following best represents the magnitude of the electric field at point S?