Re: Electric Field Mapping

[Joseph Bellina <jbellina@SAINTMARYS.EDU>]

As I recall, I improved the symmetry by placing another contact on the
ring directly opposite from the first, ie 180 degrees apart.  Perhaps that
will help.

cheers,

joe

Fanetti wrote:

> Hi all
> Today's physics lab was using the Pasco field mapper kits to map the =
> Electric field and lines of equipotential.
>
> Okay so my students were given a point charge with a guard ring aroun=
> d it.  It just wouldn't seem to work. =20
> One problem was that the potential difference on the guard ring wasn'=
> t constant.  The farther you got from the point where the electrode w=
> as connected, the lower the potential difference got.  Shouldn't it b=
> e the same?
>
> What's going on?
> Tina (user error...lots of it)
>
> Tina Fanetti
> Physics Instructor
> Western Iowa Technical Community College
> 4647 Stone Ave
> Sioux City IA 51102
> 712-274-8733 ext 1429

Joseph J. Bellina, Jr.               574-284-4662
Associate Professor of Physics
Saint Mary's College
Notre Dame, IN 46556