Re: Tesla Coil RF Transmitter

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Jim Lux <jimlux@xxxxxxxxxxxxx>

At 11:53 AM 9/19/2005, Tesla list wrote:
> Original poster: stork <stork@xxxxxxxxxxxxxxxxxxx>
>
> Tesla list wrote:
> > Original poster: Mddeming@xxxxxxx
> > In a message dated 9/17/05 1:33:01 P.M. Eastern Daylight Time, 
> > tesla@xxxxxxxxxx writes:
> > Imagine a ball with 10 cm of radius charged to 1 kV. It has a
> > capacitance of 11 pF and stores 11 nanocoulombs. If you move it at
> > 1 meter per second, the magnetic field generated is equivalent to
> > what would be generated by a current of just 11 nanoamperes.
> > Difficult to detect.
>
> Detect 11 nanoamperes?  No sweat.  Old Keithley Picoammeters are still
> very common.  They measure coulombs also.  SQUIDs even go much 
> lower. There is a good experiment in what you post.  Maybe you could do the
> experiment and post your results.
>
> Stork
Detecting 11 nA may be possible.  Detecting the field produced by 
11nA might be a bit more challenging.

One could do it this way.

Set up an electrostatically shielded coil with many turns of wire so 
that it cuts the magnetic field produced by the current.
Repetitively move the ball past the wire and average.  Maybe a 
pendulumn sort of arrangement?
The measurement is going to extract some of the energy out of the system.