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Homework Help: Magnetic field of a solenoid.

  1. Jun 26, 2011 #1
    1. The problem statement, all variables and given/known data
    A 10 cm long solenoid with 241 turns and radius R = 3.00 cm has a current flowing through it of Io = 200 mA. What is the magnetic field strength inside the solenoid (in T)?

    3. The attempt at a solution
    So i know i have to use the formula B = (uo)(n)(Io)

    uo = a constant 1.257 x 10^-6
    n = 241/.1 = 2410 N/L
    Io = 200 mA or .2 A

    So when plugging in B = (1.257x10^-6)(2410)(.2) = 6.06E-4
    I am getting the wrong answer... can someone please tell me where i went wrong?
  2. jcsd
  3. Jun 26, 2011 #2


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    Homework Helper

    I think it is correct. Are you sure you don't need to use μ0=4π(10-7)? Even though your answer would just change by a small number.
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