A current is set up in a wire loop consisting of a semicircle of radius 4.12 cm, a smaller concentric semicircle, and two radial straightlengths, all in the same plane. Figure (a) shows the arrangement but is not drawn to scale. The magnitude of the magnetic fieldproduced at the center of curvature is 47.29 µT. The smaller semicircle is then flipped over (rotated) until the loop is again entirely inthe same plane (Figure (b)). The magnetic field produced at the (same) center of curvature now has magnitude 16.03 µT, and itsdirection is reversed. What is the radius of the smaller semicircle?(a)(b)NumberUnits

Note: The expression is obtained from Biot-Savart law,

Answered: A current is set up in a wire loop…

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