Apiece of wire is bent to form a circle with radius r. it has a steady current i flowing through it in a counterclockwise direction as seen from the top (looking in the negative z-direction).
what is bz(0), the z component of b at the center (i. e., x=y=z=0) of the loop?
express your answer in terms of i, r, and constants like μ0 and π.
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