On Aug 22, 3:23 pm, Roy Lewallen wrote:
Jon Mcleod wrote:
MAYBE NOT EXACTLY THE RIGHT GROUP, but..

If I tape 2 insulated, parallel wires to the wall, x cm apart, and then
drive a sinewave into them (Vo p-p), how can I calculate the field
strength between the 2 wires?

For instance, 120KHz, 100V, 5cm apart, what is the field in V/cm between
the two wires?

Any references or information on how to calculate this would be greatly
appreciated.

Is the sine wave applied and the load, if any, connected such that the
currents in the two wires are equal and opposite? If so, the problem
becomes exactly the same as a single wire suspended above and parallel
to an infinite perfect ground plane. In the plane exactly midway between
the wires -- the position represented by the perfect ground plane in the
simplified model -- the field is zero, since the fields from the two
wires are equal and opposite in that plane. If the currents aren't equal
and opposite, the problem becomes considerably more complex.

By "between the wires", do you mean in the plane of the wires, or some
larger region?

Are you looking for a closed-form solution, or would a numerical
analysis result be adequate?

If this is a homework assignment, the professor assigning it should be
able to steer you to some suitable references.

Roy Lewallen, W7EL

Hmmm...I don't think that's quite right, Roy. I expect the E field
between the wires, in the plane of the wires, to be parallel to the
plane, perpendicular to the wires, if there is a potential between the
wires and they are straight and parallel. For a wire above ground,
the E field must be perpendicular to the ground at the ground (assumed
perfect), but it's not zero in general.

Cheers,
Tom