How to detect the electric field between two plates experimentally?
Thanks
Look up Millikan's drop experiment, and do it backwards - calculate the field from the force needed to keep the drops still.
Thanks, dear Dr.Malcolm White, I appreciated your intersting comment
The best
Another way is to put them in a vacuum and fire electrons between them, and observe their deflection, or use a magnet to balance the force and calculate the field that way.
or use a fiber probe with a field-sensitive crystal (electrostrictive, or electrooptical) on one side and Mach-Zehnder interferometer (or optical I/Q demodulator) at the other side. This method is almost non-disturbing and useful for frequencies up to hundreds of GHz
Andrey Porokhnyuk
The reason that I didn't recommend something like that is that I assumed that the measurement was for the purpose of demonstrating or convincing about the existence or strength of an electric field in a capacitor, without using the simple equation that describes it. Using a fiber probe with a field-sensitive crystal involves taking much more complicated technology on trust, and the results of more complicated equations than the simple equation for electric field in a capacitor.
but isn't it a fun research? build a high frequency field probe, most people dream of, publish a paper, then sell it for a crate of Franklins :)
Thank you very much dear Andrey Porokhnyuk for your interesting comments. Actually, we have a plan to do that
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https://www.labguysworld.com/Project_ESCRTs_001.htm
This demonstrates the field between the plates of a capacitor.
One can detect DC electric filed using moving conductors e.g. https://sodaitis.net/electric-field-mill/
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