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Unformatted text preview: left loop. • The switch had been closed for a long time and at t= 0 it was opened. The magnetic field still points to the left, but it is decreasing with time. o The induced current in the right loop is such that it must produce a magnetic field that opposes the change in the magnetic field due to the left loop. o The induced current in the left loop is the same as the current in the right loop. Both are counterclockwise. See also problem 315 on page 777 of the text for an additional example Applications of Faraday's Law • Generators: Area changes with time, but magnetic field stays constant o Φ B = B (dot product) A = BAcos θ o If the coil is being rotated, Φ B = BAcos ϖ t ξ =  d Φ B /dt = + BA ϖ cos ϖ t o If there are N turns; €€€€€€€€€ξ = +N BA ϖ cos ϖ t Several in class demonstrations were performed to demonstrate Lenz's Law and Faraday's Law...
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 Spring '07
 MAHLON,GREGORYDA
 Current, Magnetism, RC Circuits, Magnetic Field, #, Magnet, Lenz, Faraday's law of induction

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