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Homework Help: Calculating current

  1. Mar 16, 2010 #1
    1. The problem statement, all variables and given/known data
    You want to make a solenoid that is 38 cm long with 4300 turns. How much current should you run through the solenoid to produce a magnetic field of .75 T?


    2. Relevant equations
    B = uoNI


    3. The attempt at a solution
    I converted 38 cm to m (not sure where to use this number). i used the above equation but got it wrong. I have looked all in my textbook and cant find any other equation to use. help!
     
  2. jcsd
  3. Mar 16, 2010 #2

    rl.bhat

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    In the equation N is the number of turns per unit length.
     
  4. Mar 17, 2010 #3
    so N x .38?
     
  5. Mar 17, 2010 #4

    rl.bhat

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    Homework Helper

    No. Nx0.38 = total number of turns.
    N = 4300/0.38
     
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