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Homework Help: Magnetism:magnetitude of mag field

  1. Jul 17, 2003 #1


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    calculate the magnitude of the magnetic field at the center of a solenoid which has 100 turns, is .1m long and carried a current of 1A?

    n = N/l = 100/.1 = 1K then
    B= uo * n * I = 4PI x 10^-7 * 1K * 1A = 1.257x10^-3

    why is this wrong?
    dx :wink:
  2. jcsd
  3. Jul 17, 2003 #2

    Tom Mattson

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    Staff Emeritus
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    It's correct. Maybe your professor made a mistake?
  4. Jul 17, 2003 #3


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    you know I am about to say something; he has these interns who also mis grade my darn test which has got me pummling for hours trying to find out what my mistake was. This is not cool; its borderline injustice to the class I say. Just teasing but I think they should take more emphasis on grading that could be the determining factor of a passing or failing grade, you know?
    Thanks Tom,
    Dx :wink:
  5. Jul 18, 2003 #4
    Hi Dx,
    sorry you have so much trouble. Just noticed your answer doesn't have a unit (should be Tesla). Maybe that's why your prof. marked it wrong...
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