l. a) Find the magnetic field at the center of a square loop, which carries a steady current I.
Let R be the distance from the center to side.
b) Find the field at the center of a regular n-sided polygon, carryiug a steady current I,
Again, let R be the distance from the center to any side.
L
c) Check that your formula reduces to the field at the center of a circular loop. In the limit
n-> @