1. The problem statement, all variables and given/known data http://s27.photobucket.com/albums/c191/oscar888/?action=view¤t=LONCAPA.gif The four wires that lie at the corners of a square of side a= 3.50 cm are carrying equal currents i= 2.10 A into (+) or out of (-) the page, as shown in the picture. Part A: Calculate the y component of the magnetic field at the center of the square. ( I already got the answer for this one) 4.80×10-5 T Part B: Calculate the x-component of the force on a 1.0-cm long piece of the lower right-hand wire, due to the other three wires. 2. Relevant equations B=(mu*I)/(2*pi*r) mu=4*pi*a0^-7 T*m/A 3. The attempt at a solution I need help in the second part. I don't know where to start.