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Homework Help: Magnetic feild in circular coil

  1. Oct 15, 2008 #1
    1. The problem statement, all variables and given/known data

    A 20 turn circular coil of length 5.9 cm produces a magnetic field of magnitude 1.9 mT at its center. Find the current in the loop

    2. Relevant equations

    where n is the number of turns per unit length and I is current. magnetic field is B

    3. The attempt at a solution

    so i put in .0019 T for B
    i put in .059 m and divided 20 by that to find the turns per unit or m
    i plugged them in with the constant and got a red x... any suggestions?
  2. jcsd
  3. Oct 16, 2008 #2


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    Homework Helper

    Your equation isn't correct to begin with. What about the length of the coil?
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