Figure (a) shows an element of length ds =1.00 µm in a very long straight wire carrying current. The current in that element sets up a differential magnetic field dB at points in the surrounding space. Figure (b) gives the magnitude B of the field for points 2.5 cm from the element, as a function of angle θ among the wire and a straight line to the point. What is the magnitude of the magnetic field set up with the entire wire at perpendicular distance 2.5 cm from the wire?