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Re: A MC question on EM Induction

I have a spool of a large number of turns of wire (may be 500 turns) The free ends of the coil are connected to 2 LED's in parallel but oriented in opposite directions. The two LED's would preferably be of two different colors. The pvc pipe is held vertical and the spool is held around the pipe somewhere in the lower third of the 6-ft long pipe. The magnet should be of a strong variety.

AS the magnet falls through the pvc pipe and crosses the coil you will see very brief successive flashes of light from the two LED's. Hope this helps.

-Hasan Fakhruddin

-----Original Message-----
From: Mark Larchez [mailto:LarchezM@UWSTOUT.EDU]
Sent: Tuesday, April 23, 2002 11:29 AM
To: PHYS-L@lists.nau.edu
Subject: Re: A MC question on EM Induction


At 10:55 AM 2002-04-19 -0500, you wrote:
doing demostration that involves
dropping a magnet through a PVC pipe. An emf is induced in a coil of
wire around the pipe and LED's light up.



This sounds like a neat demo. I'd like to try it. Could I have some hints
about the details, please?


Should I wind the wire around a long section of the pipe and look for
steady light?

Should I wind many turns around a small section near the bottom of the pipe
and watch for a flash of light?




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Mark Larchez larchezm@uwstout.edu
Physics Dept. voice or message (715) 232-2153
University of Wisconsin-Stout Dept. Office (715) 232-2626
Menomonie WI 54751 USA fax (715) 232-1437
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