1. The problem statement, all variables and given/known data Find the B-field at the center of the square loop located above the xy plane, with width (w), and current I rotating counter-clockwise. 2. Relevant equations Here is the given equation: B = [(μo*I*aФ)/(4∏*ρ)](cosα2 – cosα1) The final answer is for the B-field about the loop is: B = [(4μo*I)/(∏*w*(√2))]az How do I obtain this answer? I am having trouble with the angles that I am supposed to use. 3. The attempt at a solution I used (w/2) for the radial component, ρ. I used 45 degrees for α2, and 90 degrees for cosα1, and this is obviously wrong. Which angles do I use to get the correct angle?