Date: Fri Aug 7 14:35:47 2009
Author: --- cbettis
Subject: Re: Variation on a demo I saw at Ann Arbor
Yes, when you inverse the polarity of either the coils or the magnets
they move in opposition.
Quoting Bill Reitz :
> I didn't see the demo demonstrated there but have been following the
> thread & have done something similar. Forgive me if this was what was
> shown. Have you tried changing the connections? First with top of
> both solenoids connected together & bottom of each together. You then
> will see one magnet lag the other. Then either change connections (or
> more simply turn one over) so that the top of one is now connected to
> the bottom of the other and vice versa. You can get magnets to go up
> and down together. Also tryt flipping one or both magnets.
> Bill Reitz
> chuck britton wrote:
>> I'll bite -
>> The DRIVEN magnet (the one you'll be stopping) is generating the
>> 'back emf' of the other's induced current.
>> When the back emf goes away the current will spike and better
>> oppose the remaining magnet's motion, perhaps stopping it.
>> On Aug 7, 2009, at Aug 7(Fri) 9:58 , Sam Sampere wrote:
>>> Poser: If you set the apparatus into oscillation and stop by hand
>>> one of the magnets, what happens to the current?