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Find distance with magnetic field and current?

  1. Mar 12, 2012 #1
    1. The problem statement, all variables and given/known data

    At what distance (in m) from a very thin, straight wire carrying a 38 A current would the magnetic field strength be the same as a refrigerator magnet of 4.35 x 10-3 T?

    2. Relevant equations

    B=(μo/2pi)*(I/d)
    where μo=4pi*10^-7

    3. The attempt at a solution

    4.35e-3(d)=2.0e-7*(38)
    d=.0017m
    It says this is wrong? so I must have done something wrong.. any help would be appreciated!
     
  2. jcsd
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