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Distance away to create the same magnetic field strength?

  1. Mar 13, 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!
    Thanks for your time!
     
  2. jcsd
  3. Mar 13, 2012 #2
    that's what I got too, is this an online homework? Did you try 0.00169? Sometimes they can be annoying with sig figs.
     
  4. Mar 13, 2012 #3
    Yes, I just tried that.. and it didn't say it was correct. It usually will give me the answer if it is that close but it says that is the wrong answer.
     
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