A loop is oriented as shown below inside a region of uniform and constant external magnetic field. The B-field lines point straight upwards. The normal to the loop is parallel to the external B-field lines. The dashed parts of the loop are behind the screen and the solid parts of the loop are in front of the screen. The external magnetic field has a magnitude of B and the area of the loop is A. The loop is then rotated by 180° around the axis shown. The magnitude of the change in flux through the loop (AF) is equal to: B- field O 0.5 BA O -BA O 2 BA О ВА

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