The charges q1 = + 3.25 nC is placed at -3m from the origin on the x axis and q2 = +5nC is placed at 1.07 m from the origin on the x axis.
Calculate the net Electric Field (magnitude) at the origin.

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.