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

Question

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. (Use the following as necessary: u_0 for ?0, pi for ?, r, and I.)

magnitude Btot = I got this, it's just four times the amount

direction = out of page

(b) Compare your answer with the magnetic field at the center of a circular loop of radius r carrying current I.

Btot/Bloop =

I was sure that the answer for b was 4/pi, but it's telling me that's wrong. Can you please do b and show your work? Thanks!

Explanation / Answer

4/pi is right answer may be answer is wrong in the system

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