(a) Find the magnetic field at the center of a square loop, which carries a steady current I. Let R be the distance from center to side (Fig. 5.22).
(b) Find the field at the center of a regular n-sided polygon, carrying a steady current I. Again, let R be the distance from the center to any side.
(c) Check that your formula reduces to the field at the center of a circular loop, in the limit n→∞.
Reference figure 5.22
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