Re: [Phys-l] Capacitance problem

[Bernard Cleyet <bernardcleyet@redshift.com>]

Did you try air dielectric caps.  e.g. broadcast band tuning  
(variable) ones.?  Being order 300 pF will require an electrometer,  
e.g. op amp w/ > 30 gigaohm   (time constant ~ ten seconds).     
Compare this to a 20 cm (0.2 m) sphere of cap. ~ 11 pF.  This brought  
next to one of the caps should noticeably change its potential.

bc


On 2008, Mar 28, , at 14:22, mrmeyer@mtu.edu wrote:

> To this point, we have been unable to show any predictable, measurable
> effect/difference caused by the environment--which is what Dr.  
> Suits is
> looking for.  But this is something we'll keep playing with as time
> allows.
>
> Mike
>
> > Mike,
> > You said you were wiring it up and testing it.  What were your
> > experimental results?
> > Jeff Schnick
> >
> > > -----Original Message-----
> > > From: phys-l-bounces@carnot.physics.buffalo.edu [mailto:phys-l-
> > > bounces@carnot.physics.buffalo.edu] On Behalf Of mrmeyer@mtu.edu
> > > Sent: Tuesday, March 25, 2008 3:30 PM
> > > To: phys-l@carnot.physics.buffalo.edu
> > > Subject: [Phys-l] Capacitance problem
> > >
> > > I've been told that this problem is not analytically solvable--which
> > is
> > > interesting because it's a simple circuit that could be wired up and
> > > tested...which we're doing now.
> > >
> > > http://www.phy.mtu.edu/~suits/PH2260/CapProblem.pdf
> > >
> > > I'd be interested in your comments.
> > >
> > > Mike Meyer
> > > Michigan Tech Physics Dept.
> > > mrmeyer@mtu.edu