Experimentally, this would probably be impossible to verify, as the noise of a resistor causes an extremely low current. The force to be measured would be of the order of µN or even nN. On the other hand, if the force were electrical, it would be easy. A current that would reflect the mechanical force of the wattmeter's needle would be proportional to the product of the currents in each coil, and since they all have the same current flowing through them, to the square of that current. Let's take the example of an alternating current in the coils, which in no way detracts from the generality. Then, by virtue of sin²a = 1/2 - 1/2cos 2a, we'd see a DC component (1/2), and a double-frequency component (2a). The former would be easily detectable at least with a µAmp meter, and the latter with a radio receiver (as is the case when using a diode bridge).
But how can the principle give rise to a force on charges, i.e. a current, rather than a mechanical torque? I've been pondering this question for a long time, to no avail. I've also experimented with quite a few ideas without ever detecting the slightest double-frequency signature, even with strong currents. Why is it that it's so easy to obtain this mechanical force, which is in a way the rectification of an alternating current - a rectification which, unlike diodes, has no threshold effect - and that this type of rectification is impossible to obtain in electrical form? It seems to me that there's a missing link here, and I wonder if Coler's device is a solution.
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"Open your mind, but not like a trash bin"
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