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This is College Physics
Answers with Shaun Dychko.

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The Hall Effect voltage is
the magnetic field strength

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times the diameter of the pipe

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and then times the speed of
the fluid travelling through it.

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And so we can solve for <i>v</i>
by dividing both sides by

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magnetic field strengths and pipe diameter.

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And so that's going to be 60 times
ten to the minus three Volts

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because that's what 60 milli Volts
is after you convert into Volts

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and then divided by 0.5 Tesla times three
times ten to the minus two meters

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and this gives 4.00 meters per second.