Date: Fri Sep 7 20:07:59 2007

Author: Bernard Cleyet

Subject: Re: Wolfgang's Article on Charge Conservation demonstration

Post:
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Referring to the pic.: Now I'm confused. It appeared the lead(s) from =

the cylinders went to high Z opamps and then to a meter, not to leaf=20
electroscopes. =20

bc

Wolfgang Rueckner wrote:

> Indeed, that's a question that's often raised by students and the=20
> answer needs to be discussed when that objection is raised. -- Wolfga=
ng
>
>
>
> On Sep 7, 2007, at 1:03 PM, Bernard Cleyet wrote:
>
>> One important point not mentioned, unless I missed it, is that even=20
>> tho some charge will not reside on the surface of the cylinders, but=20
>> on the fur, it doesn't matter. I'm surprised no student has=20
>> questioned this, or is it the a demo. showing this preceded the Q=20
>> conservation demo?
>>
>> bc
>>
>> Wolfgang Rueckner wrote:
>>
>>> Yes I did tinker with them, Cliff.=EF=BF=BD I encountered the same "z=
ero"=20
>>> problem as you.=EF=BF=BD --=EF=BF=BD W
>>>
>>>
>>> On Sep 6, 2007, at 2:39 PM, Cliff Bettis wrote:
>>>
>>>> Wolfgang,
>>>> =EF=BF=BD
>>>> Did you take any pains to make your electroscopes identical? I ask=20
>>>> because I have been trying to make the Pasco electroscopes you=20
>>>> mentioned in your article as sensitive as possible and still not=20
>>>> "stick" when discharged. I used them today under abysmally humid=20
>>>> conditions (Faraday Ice Pail demonstration) and they worked but I=20
>>>> still have the urge to tinker with them to get one of them in=20
>>>> particular to zero better.
>>>> =EF=BF=BD
>>>> (My wife needs to hide her cooking pots and sweaters, because I'm=20
>>>> going to try your demonstration)
>>>> =EF=BF=BD
>>>> Cliff
>>>>
>>>
>

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Referring to the pic.:=C2=A0=C2=A0 Now I'm confused.=C2=A0 It appeared th=
e lead(s)
from the cylinders went to high Z opamps and then to a meter, not to
leaf electroscopes.=C2=A0=C2=A0=C2=A0

bc

Wolfgang Rueckner wrote:
Indeed, that's a question that's often raised by students
and the answer needs to be discussed when that objection is raised.=C2=A0=

--=C2=A0 Wolfgang






On Sep 7, 2007, at 1:03 PM, Bernard Cleyet wrote:

One important point not mentioned, unless I
missed it, is that even tho some charge will not reside on the surface
of the cylinders, but on the fur, it doesn't matter.=C2=A0 I'm surprised =
no
student has questioned this, or is it the a demo. showing this preceded
the Q conservation demo?

bc

Wolfgang Rueckner wrote:
Yes I did tinker with them, Cliff.=EF=BF=BD I encountered =
the same
"zero" problem as you.=EF=BF=BD --=EF=BF=BD W




On Sep 6, 2007, at 2:39 PM, Cliff Bettis wrote:


Wolfgang,
=EF=BF=BD
Did you take any pains to=

make your electroscopes identical? I ask because I have been trying to
make the Pasco electroscopes you mentioned in your article as sensitive
as possible and still not "stick" when discharged. I used them today
under abysmally humid conditions (Faraday Ice Pail demonstration) and
they worked but I still have the urge to tinker with them to get one of
them in particular to zero better.
=EF=BF=BD
(My wife needs to hide
her cooking pots and sweaters, because I'm going to try your
demonstration)
=EF=BF=BD
Cliff=















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