A current is set up in a wire loop consisting of a semicircle of radius 4.00 cm, a smaller concentric semicircle, and two radial straight lengths, all in the same plane. the arrangement but is not drawn to scale. The magnitude of the magnetic field produced at the center of curvature is 47.25 mT. The smaller semicircle is then flipped over (rotated) until the loop is again entirely in the same plane .The magnetic field produced at the (same) center of curvature now has magnitude 15.75 mT, and its direction is reversed from the initial magnetic field.What is the radius of the smaller semicircle?

College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
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Chapter1: Units, Trigonometry. And Vectors
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A current is set up in a wire
loop consisting of a semicircle of radius
4.00 cm, a smaller concentric
semicircle, and two radial straight
lengths, all in the same plane. the arrangement but is
not drawn to scale. The magnitude
of the magnetic field produced at
the center of curvature is 47.25 mT. The smaller semicircle is then
flipped over (rotated) until the loop is again entirely in the same
plane .The magnetic field produced at the (same) center
of curvature now has magnitude 15.75 mT, and its direction is
reversed from the initial magnetic field.What is the radius of the
smaller semicircle?

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