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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 ∆ ∆ = ∆ ∆Φ = ε Another method: ⊕ B v F B F E qvB F B = qE F E = Blv El qvB qE = = ⇒ = ε 1) What is polarity of EMF ? 2) What would be the direction of the induced current, if rod slides on a conducting track ? Blv = ε 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 righthand 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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 Fall '05
 Ogilvie
 Current, Magnetic Field, Blv Blv I=, induced current runs

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