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If I have a some a wire and I took part of it and created a circle. If I want to calculate the strength of the magnetic field at the center of it. I should just use the magnetic field equation for the circular loop, shouldn't I?

## B = \frac{U_o N I}{2R} ##

and I shouldn't care about the intersection between the circle and the wire itself because the equation will include that point and the wire doesn't have an effect on the center of the circle.

And why if I want the magnetic field at the center this equation doesn't work?

##B = 4 ( \frac{U_O I}{ 2 \pi d} )##

I have seen a webpage before that uses calculus in order to solve this (Havent taken it yet) But what does calculus has to do in this shape? Reference: http://www.physicspages.com/2013/04/11/magnetic-field-of-square-current-loop/

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