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A loop of a wire has the shape shown in the drawing. The top part of...

A loop of a wire has the shape shown in the drawing. The top part of the wire is bent into a semicircle of radius r = 0.23 m. The normal to the plane of the loop is parallel to a constant magnetic field of magnitude 0.85 T. What is the magnitude of the change in the magnetic flux that passes through the loop when, starting with the position shown in the drawing, the semicircle is rotated through quarter of a revolution? (please explain in details, and this is my third time posting this question, please notice that it's through quarter of a revolution not half!!!!)

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