Re: Tesla Coil RF Transmitter

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Antonio Carlos M. de Queiroz" <acmdq@xxxxxxxxxx>

Tesla list wrote:

> Original poster: stork <stork@xxxxxxxxxxxxxxxxxxx>
> Thank you Jim!
> Electrometers are designed to ONLY detect electrostatic 
> fields.  They cannot and do not detect magnetic fields.  This is the 
> very point of this whole thread.  This is a time varying electric 
> field without an associated magnetic field.  The transmitter and 
> receiver are longitudinal and non Hertzian.  Electrometer probes 
> oriented perpendicular to E field lines capture the radiated E 
> field. The arrangement receives only longitudinal E field 
> radiation.  Experiments bear this out, it's not "proven" by some 
> convoluted theory.

This "longitudinal" field is a "local" field in antenna theory. It
decreases to practically zero at quite short distance. The experiment
really produces a magnetic field, and electromagnetic waves.
If you just wave a charged body in your hand they are of minuscule
intensity, but they are there.
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.
The field is fixed around the ball, and electromagnetic waves
are only emitted when the ball is accelerated.
Use this ball as a cannon ball, and a detectable field may appear.
A rotating charged toroid would produce a magnetic field similar
to the field generated by a single turn coil. With practical sizes
and speeds, the equivalent current and field are small too.
If you keep thinking about magnetic fields generated by moving
charged bodies, you will soon end in relativistic questions...

Antonio Carlos M. de Queiroz