Physics

A square-shaped loop carries current I. What is the magnitude and the direction of the magnetic field at point P, which is located on the bottom segment of the loop? Each side of the square loop has length d. The answer should be given in terms of d, I, pi, and the permittivity constant.

I know that the magnetic field at P points into the page and that it is equal to the sum of the magnetic fields from each of the segments of the loop, but I'm not sure how to calculate each of the segments' magnetic field contributions. Thanks!

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