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Homework Help: Calculating B

  1. Jul 5, 2008 #1
    What is the magnetic field at the center of a 60-turn coil carrying a current of 4 A, if it has a radius of 0.2 m?

    I was thinking of using the equation B=(mu0)(N/l)(current)

    But I was wondering do I use the radius for l or do I use the diameter?
  2. jcsd
  3. Jul 5, 2008 #2


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    Homework Helper

    I think you need to consider it as flat circular coil instead of a solenoid

    [tex]B=\frac{\mu_0 NI}{2r}[/tex]
  4. Jul 5, 2008 #3
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