A current is set up in a wire loop consisting of a semicircle of radius 4.30 cm, a smaller concentric semicircle, and two radial straight lengths, all in the same plane. Figure (a) shows the arrangement but is not drawn to scale. The magnitude of the magnetic field produced at the center of curvature is 48.00 μT. The smaller semicircle is then flipped over (rotated) until the loop is again entirely in the same plane seen in figure (b). The magnetic field produced at the (same) center of curvature now has a magnitude of 14.50 μT, and its direction is reversed from the initial magnetic field. What is the radius of the smaller semicircle?
_____________cm
(please show units. It really helps me out)
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