Figure (a) shows an element of length ds = 1.15 �m in a very long straight wire carrying current. The current in that element sets up a differential magnetic field d at points in the surrounding space. Figure (b) gives the magnitude dB of the field for points 2.6 cm from the element, as a function of angle ? between the wire and a straight line to the point. What is the magnitude of the magnetic field set up by the entire wire at perpendicular distance 2.6 cm from the wire?
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