Re: Tesla Coil RF Transmitter

["Tesla list" <tesla@xxxxxxxxxx>]

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.
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



Where in our relativistic universe does one find a straight line in 
which to move the ball? There is always at least one reference frame 
with respect to which the ball is moving in an arc (dv/dt)<>0,and 
therefore producing a magnetic field in that reference frame.

Matt D.