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Magnetic field inside a sperical coil

  1. Jun 13, 2010 #1
    1. The problem statement, all variables and given/known data
    What is the induction in the centre of a spherical coil with N turns, the current I and the radius R?

    2. Relevant equations
    Biot-Savart law [tex] \mathbf{B} = \int\frac{\mu_0}{4\pi} \frac{I d\mathbf{l} \times \mathbf{\hat r}}{|r|^2}[/tex]

    3. The attempt at a solution
    I know what the induction from one turn is but I don't have a clue how to sum these up. And as have to have this homework done by Tuesday I'll be most grateful for any help.
  2. jcsd
  3. Jun 13, 2010 #2
    In Biot-Savart law you may change
    I to NI.
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