Which mass flow meter consists of U-shaped tubes with an electromagnetic coil?

The Coriolis flow meter operates on the principle of measuring the mass flow of a fluid by detecting changes in the vibration frequency of a U-shaped tube through which the fluid flows. When fluid passes through the tube, it induces a phase shift in the vibration of the tube due to the mass flow and inertia of the fluid. This phase shift correlates directly with the mass flow rate of the fluid.

In contrast, while a magnetic flow meter (often referred to as a "mag meter") utilizes electromagnetic principles to measure flow, it does not employ U-shaped tubes. Positive displacement flow meters and ultrasonic flow meters also rely on different operating principles and do not utilize U-shaped tubes or electromagnetic coils in the same manner as the Coriolis design. Therefore, the distinct construction and measurement method of the Coriolis flow meter using U-shaped tubes and electromagnetic principles make it the correct answer.