Date: Thu Feb 22 10:55:23 2007

Author: Wolfgang Rueckner

Subject: Re: dissectible capacitor

Post:
Dale -- Use a couple of metal cans; one can sits on top of the
electroscope and the 2nd one on an insulator. Place the candle in
the 2nd one, fill with water, and ground the can (this should get the
system to be neutral). Remove the ground. Pull the candle out and
place it into the can atop the electroscope, which will indicate a
charge (it's not very dramatic). I'm using a rather large candle (3"
dia x 6" long) and I've tied a piece of fishing line to the wick for
the purpose of handling it w/o touching it. -- Wolfgang


On Feb 22, 2007, at 9:17 AM, Dale Stille wrote:

>
> Wolfgang,
>
> Yes, that triboelectric effect demo is the one I am trying to
> duplicate.
> So, do you happen to know how to get the system initially "neutral".
> When I put mine together, it always seems to have a very large plus
> charge as an initial condition.
>
> Later,
> Dale
>
> On Wed, 21 Feb 2007, Wolfgang Rueckner wrote:
>
>> That experiment, as Michael Thomason surmised, was the
>> triboelectric effect using paraffin and water (and pulling a
>> paraffin ball out of water indeed produces charge separation).
>> The water version of the dissectible capacitor is more along the
>> lines of Franklin's teapot, which Robert Morse describes in his
>> book "Teaching About Electrostatics." -- Wolfgang
>>
>>
>> On Feb 21, 2007, at 9:19 AM, Dale Stille wrote:
>>
>>> Tappers,
>>> Long ago, I believe there was a discussion about dissectible
>>> capacitors where someone mentioned a version that consisted of a
>>> beaker of water and a wax or parafin ball. Can someone give me
>>> more details on that version of the demo.
>>> Thanks,
>>> Dale Stille
>>> U of Iowa
>>


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