A water drop in electrostatic orbit around a needle in 0𝑔pic.twitter.com/G2x3Ud195K
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What's going on? • The needle has been given an electrostatic charge by rubbing it on silk • Water droplets are placed by the needle w/ velocity v≠ 0 • H₂O has a slight separation of charge (i.e a dipole moment) so it feels the needle's charge
+ Coulomb's law --> orbit4 replies 11 retweets 135 likesShow this thread -
Replying to @InertialObservr
Are you sure this is correct? The force due to induced polarization is ~ 1/r^5 for a point charge, and ~ 1/r^3 for a line charge, neither of which admits a stable orbit.
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Replying to @gravity_levity
the experimenter said that only the needle was charged in the video .. I had thought that the distance from the needle made it seem as a point charge to the needle
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but am i sure? well no.. i think a lot of it will depend on the charge distribution of the needle
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