A segment of wire of length 4 m lies along the y-axis with its center at the origin. Which of the following integrals is correct for the magnetic field at a position x along the x-axis?
1) ∫(4/((x-2)² + 4))dx
2) ∫(4/((x+2)² + 4))dx
3) ∫(4/((x-2)² + 16))dx
4) ∫(4/((x+2)² + 16))dx
