On 2/15/2010 12:54 AM, Winston wrote:
On 2/14/2010 11:07 PM, Don Foreman wrote:

(...)

You demonstrated quite the contrary with your experiment.

No, in my first experiment, I was not able to determine any voltage
difference across the wire connecting the top of R1 to the top of R2.

(...)

Yes, and in my experiment, that voltage difference across the
entire winding was about 120 mV, open circuit.


These two statements sound much less whacky when you recall that
EMF induced into a wire falls as the *cube* of the distance from
the magnetic field.
The loop connecting the top of R1 to the top of R2 was far enough
away from the magnetic field to prevent much induction.
The wire sections placed on both sides of the core acted as two
separate inductors, each of which converted a tiny portion of
the field to ~60 mV of EMF.

--Winston

On 2/15/2010 12:54 AM, Winston wrote:

When I saw the maximum voltage in my 2nd experiment, it was being
dropped across a ~22.8 K ohm resistor.

Let me clarify that.

Maximum voltage readings between the center tap and ground occurred
when R1 was nearly zero ohms and R2 was at maximum (22.8K).
The other maximum occurred with R1 at 22.8K and R2 at nearly zero ohms.
The voltage was continuously produced by the inductor sections
attached to the top of the resistors but only became visible as
the associated resistor *fell* in value.

Our voltage readings came from the inductor - resistor network that
had the *lowest* value of series resistance.

--Winston