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Re: A MC question on EM Induction



Mark's idea of dropping a magnet through a solenoid (below) sounds like a
really
"neat" demo. Several years ago, in my advanced placement physics
course, a student was interested in predicting the waveform that would
be produced
on an oscilloscope when a bar magnet at rest was permitted to free-fall
through a vertical solenoid 50 cm long.

The class made their predictions and the trace on the oscilloscope screen
was photographed to see whose prediction was closest to the actual
photograph. It really sparked interest with the joy of true discovery
for the class.

Herb Gottlieb from New York City
(Where low salaries in the high schools are driving out our best physics
teachers now.)

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On Tue, 23 Apr 2002 10:29:25 -0500 Mark Larchez <LarchezM@UWSTOUT.EDU>
writes:
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?
***************************************
YES! It's certainly worth trying
******************************************
Should I wind many turns around a small section near the bottom of the
pipe and watch for a flash of light?
*****************************************
YES! It's certainly worth trying.
****************************************
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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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