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3. A proton moves with a velocity = 21 of m/s in a region in which the magnetic field is B = 5k T, the magnitude of the magnetic force this charge experiences is_ 4. The U-shaped conductor in Figure lies perpendicular to a uniform magnetic field with magnitude directed into the page. We lay a metal rod with length across the two arms of the conductor, forming a conducting loop, and move the rod to the right with constant speed. The magnitude of the resulting emf is_ TOO K X X V K DA x x xx