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My bet is it's the vibration frequency of phone A. The vibrator in phone A causes pressure waves through the material to end up driving a 22 Hz oscillation on phone B's accelerometer.


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DC current is organized as following: positive potential applied to one end of the wire, negative potential applied to the other. Electrons move from one end to another with some speed. If you have one electron in vacuum and electric field from A to B, then there will be force acting upon that electron due to $F=eE$. Movement should happen along line ...



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