Magnetic fields

  • Thread starter map7s
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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?
 

Answers and Replies

  • #2
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Remember that V is a scalar and E is a vector. They are related somehow or another...
 
  • #3
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There is a simple equation for induced emf that applies here
 
  • #4
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In my calculations I wasn't able to include V, but I know that I should. However, I don't know how the two relate to each other in an equation....Also, I don't think that I've learned about emf...
 

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