Four long straight wires, each with current I, overlap to form a square with side 2r. (a)

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Four long straight wires, each with current I, overlap to form a square with side 2r. 

(a) Find the magnetic field at the center of the square.

(b) Compare your answer with the magnetic field at the center of a circular loop of radius r carrying current I [see Eq. (19-32)].

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