Explanations of Last Lecture's Demonstrations:

Explanations of Last Lecture's Demonstrations: - Physics...

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Physics 202 Tuesday, April 13, 1999 Announcements: Lecture notes: Explanations of Last Lecture's Demonstrations: 1. 1. Eddy Current o When the magnetic flux through a conductor changes, induced current appears in the conductor in the direction that opposes the charge (Lenz's Law) 2. 2. Eddy Current
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o The magnet falls very much slower than a nonmagnetic object inside a metal tube. o Why? Induced current and therefore induced magnetic field are set up inside the tube to oppose the falling down of the magnet 2. 3. Flying Ring Experiment o As the switch is rapidly closed: B and Φ B in the iron core increases (rapidly) into B pointing up. o This induced a current in the ring ( with B induced pointing down)
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o This is similar to the case with two magnets, with north poles pointing at each other---Hence the repulsive forcce causing the ring to fly up. Further explanation of the Flying wheel, induced current and induced electric field...
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