A piece 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 B_z(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 mu_0 and pi.
The Attempt at a Solution
I know this equation:
but there is a hint that says I need to find the Integrand.