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Homework Help: Solenoid turns

  1. Mar 30, 2010 #1
    1. The problem statement, all variables and given/known data
    Prove that the number of turns per length on a solenoid is equal to 1/(diameter).

    2. Relevant equations
    A= 2(pi)(R)

    3. The attempt at a solution

    number of turns= length/(2pi*radius)
    number of coils per length=(length/(2pi*radius))/length
    number of coils per length=1/(2pi*radius)

    I'm not sure why I have an extra pi. Did I do something wrong?

    Thanks for any help.
  2. jcsd
  3. Mar 30, 2010 #2


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    Homework Helper

    Re: Solenoid

    In the problem the diameter is the diameter of the wire, not the diameter of the solenoid.
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