How fast should a space station ring with a diameter of 225 meters spin to create 1g of artificial gravity due to centripetal acceleration?

Two large, flat, horizontally oriented plates are parallel to each other, a distance d apart. half way betwween the two plates the electric field has magnitude e. if the separation of the plates is reduced to d/2 what is the magnitude of the electric field half way between the plates?

Anybody wanna ? (picture included? )

Compare the horizontal displacement of the two balls as they travel to the ground. what do you observe?