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## Homework Statement

An artery has an inside diameter of 3.20 mm and passes through a region where the magnetic field is 0.065 T.

If the voltage difference between the electrodes is 155 µV, what is the speed of the blood?

## Homework Equations

V=kq/r E=kq/r^2 v=E/B

## The Attempt at a Solution

I know that I have to ultimately use the last equation to find out velocity, but I need to first find out E. I tried using the second equation, but I am not quite sure as to what I'm doing wrong. First of all, is that right equation? For q, am I supposed to use the charge of an electron/proton? is r supposed to be entire diameter or should I divide it half?