Two circular plates, each with a radius of 8.22 cm,8.22 cm, have equal and opposite charges of magnitude 3.952 μC.3.952 μC. Calculate the electric field between the two plates. Assume that the separation distance is small in comparison to the diameter of the plates.

Awater-filled u-tube manometer is used to measure the pressure inside a tank that contains air. the water level in the u-tube on the side that connects to the tank is 5 ft above the base of the tank. the water level in the other side of the u-tube (which is open to the atmosphere) is 2 ft above the base. determine the pressure within the tank.