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Homework Help: Current in a Solenoid

  1. Sep 19, 2012 #1
    1. The problem statement, all variables and given/known data

    A 27.0-cm long solenoid 1.25 cm in diameter is to produce a field of 0.215 T at its center. How much current should the solenoid carry if it has 900 turns of the wire?

    2. Relevant equations

    B = μIN / l

    3. The attempt at a solution

    Why am I given the diameter plus the length? Everything else is obvious except this concept. I thought l would equal = 0.27 m. Should I add 0.625 + 0.27 m because the magnetic field is produced at the center?
  2. jcsd
  3. Sep 19, 2012 #2
    you don't need the diameter at all for this problem ;)
  4. Sep 19, 2012 #3
    Aha! Extra information! Thank you.
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