Date: Thu Oct 30 11:14:59 2008

Author: Zani, Gerald

Subject: Re: displacement current

Post:

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Sam,

=20

I'd be interested in knowing if you can make it work.

=20

Read Dick Berg's page:

http://www.physics.umd.edu/deptinfo/facilities/lecdem/services/demos/dem
osk2/k2-63.htm=20

=20

I've never had luck with this demo for two reasons. It is tricky to do
correctly. And when I do get it working the Faculty are not
theoretically convinced that the signal is any different from an RF
antenna signal.

=20

1.) To do it the pick-up coil must be a many turns iron core Toriod.

=20

2.) The AC signal on the cap plates should be of high frequency. One
handy, free way to get a very high frequency signal is to get an old VCR
player, play a video tape and take the RF signal output out the back.
RF modulators with a 4 MHz bandwidth are commonly found built into old
VCRs.

=20

=20

There is lots of literature on this.

=20

See Dick Berg's references at the above link.

=20

Here is an article that uses a SQUID magnetometer and a lock-in amp to
do it!:

=20

Phys Rev Letters, Vol. 55 number 1, 1 July 1985. D. F. Bartlett and
T.R. Corle

=20

=20

Best,

- JZ

From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] On
Behalf Of Sam Sampere
Sent: Thursday, October 30, 2008 10:27 AM
To: tap-l@lists.ncsu.edu
Subject: [tap-l] displacement current

=20

Dick,

=20

For the life of me, I don't get a very nice amplitude change when
placing a coil in mutually perpendicular directions between cap plates
connected to a function generator. Can you elaborate on your equipment
please??? What important feature might I be missing...?

=20

Thanks,

=20

Sam

=20

--------------------------=20
Sam Sampere=20
Syracuse University=20
Department of Physics=20
201 Physics Building=20
Syracuse, NY 13244=20
315-443-5999=20
315-443-9103 (fax)=20

=20


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Sam,



Iíd be interested in knowing if you can make it =
work.



Read Dick Bergís page:

http://www.physics.umd.edu/deptinfo/facilities/lec=
dem/services/demos/demosk2/k2-63.htm




Iíve never had luck with this demo for two =
reasons.
It is tricky to do correctly. And when I do get it working the =
Faculty
are not theoretically convinced that the signal is any different =
from an RF
antenna signal.



1.)
To do it the pick-up coil must be a many turns iron core =
Toriod.



2.)
The AC signal on the cap plates should be of high =
frequency.
One handy, free way to get a very high frequency signal is to get an old =
VCR
player, play a video tape and take the RF signal output out the back. =
RF
modulators with a 4 MHz bandwidth are commonly found built into old =
VCRs.





There is lots of literature on =
this.



See Dick Bergís references at the above =
link.



Here is an article that uses a SQUID magnetometer and a =
lock-in
amp to do it!:



Phys Rev Letters, Vol. 55 number 1, 1 July 1985. D. =
F.
Bartlett and T.R. Corle





Best,

-
JZ





From:=

tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] On =
Behalf Of Sam
Sampere
Sent: Thursday, October 30, 2008 10:27 AM
To: tap-l@lists.ncsu.edu
Subject: [tap-l] displacement current







Dick,



For
the life of me, I donít get a very nice amplitude change when =
placing a
coil in mutually perpendicular directions between cap plates connected =
to a
function generator. Can you elaborate on your equipment please??? What
important feature might I be missingÖ?



Thanks,<=
/o:p>



Sam



--------------------------

Sam
Sampere
Syracuse
University
Department
of Physics
201
Physics Building
Syracuse,
NY 13244
315-443-5999

315-443-9103
(fax)









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