In the region of space shown in the diagram, there is a uniform magnetic field of strength 0.128 T in the direction of the +z axis. What is the magnetic flux across the surface abcd?

A. 0.0115 Wb
B. 0.000 Wb
C. 0.0230 Wb
D. 0.0512 Wb

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.