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The average fluid velocity in a 3. 50-cm-diameter pipe, if a 0. 750-t field across it creates a 75. 0-mv hall voltage is 2. 87 m/s.The magnetic field created by the current flow inside the pipe produces a voltage difference between the inside and outside of the pipe. The magnitude of this voltage depends on the strength of the magnetic field and how far from it you measure its effect on your meter. In this case, we're measuring from one end of our pipe to another, so we'll need to multiply our answer by 2.We know that: Hall effect = current*magnetic field strength * lengthIn this equation, we know that "length" is equal to 3. 50 cm, so all we need to do is calculate our other values and plug them in.To learn more about fluid velocity visit: https://brainly.com/question/17010211#SPJ4