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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 --> orbit
slight correction:
As @gravity_levity pointed out, the force induced from polarization doesn't go as 1/r² , and so Coulomb's law isn't quite enough to explain the orbit.
What we can conclude from this however, is that the orbit is unstable.
Cool. Why does it come back to the left at the end?
it must be that the charge isn't uniformly distributed along the needle .. that's all i can come up with
You mean a neutral drop with a charged needle, right? Gets attracted until very close, then polarisation of the drop leads to repulsion. I know an interesting paper on this topic (with two spheres).
well drops of water are neutral but H20 has a dipole moment and so they will interact with a charged object as if it has a nonzero charge
holy fuck
Woah that's crazy cool
This is so f’ing cool.
If only we had classrooms in space...this is so much cooler than scotch tapepic.twitter.com/tMfpP9g0JW
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