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Homework Help: Magnetic Field and solenoids

  1. Feb 27, 2012 #1
    1. The problem statement, all variables and given/known data

    A 0.20 m long solenoid contains 1000 turns and carries a current of 5.0 A. What is the strength of the magnetic field at the center of the solenoid if its radius is 10-2m?

    a. 35.1*10-1T

    b. 8.2*10-1T

    c. .95*10-2T

    *d. 6.3*10-3T

    2. Relevant equations

    B=μo*nI/l

    3. The attempt at a solution

    B=(4∏*10^-7)*1000*5A/.2m
    B=3.14x10^-2T

    the answer key says its 6.3x10^-3T...what am I doing wrong?
     
  2. jcsd
  3. Feb 27, 2012 #2

    gneill

    User Avatar

    Staff: Mentor

    It could be that the answer key is wrong since your calculation looks fine.
     
  4. Feb 27, 2012 #3
    Thanks!
     
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