Four infinite straight currents are perpendicular to the plane of the page as shown in the figure below (a dot indicates a current coming out of page, a cross indicates a current coming in). Find the magnetic field (magnitude and direction) at the origin.
Each are the same distance apart from the origin (10cm) all on either the x or y axis.
The one in the positive x axis has a dot the rest have crosses. Each have 2A next to them.