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Unformatted text preview: 12b. EMF induced in a moving conductor B v t v x = l t lv x l A = = A t A B t B - = - = Another method: B v F B F E qvB F B = qE F E = Blv El qvB qE = = = 1) What is polarity of EMF ? 2) What would be the direction of the induced current, if rod slides on a conducting track ? Blv = The B field points out of the page . The flux is increasing since the area is increasing. The induced B field opposes this change and therefore points into the page . Thus, the induced current runs clockwise according to the right-hand rule. Example: A uniform magnetic field B is perpendicular to the area bounded by the U shaped conductor and a movable metal rod of length l. The rod is moving along the conductor at a speed v . The total resistance of the loop is R . What is the induced emf, the current in the loop, the magnetic force on the moving rod, and power needed to move the rod?...
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- Spring '11