A water drop in electrostatic orbit around a needle in 0𝑔pic.twitter.com/G2x3Ud195K
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Replying to @InertialObservr
Cool. Why does it come back to the left at the end?
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Replying to @soonest_mended
it must be that the charge isn't uniformly distributed along the needle .. that's all i can come up with
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Replying to @InertialObservr @soonest_mended
Was thinking about that too. For an infinitely long uniformly charged needle I wouldn't expect a net force along the axis of the needle; as soon as you make the needle's length finite tho, the drop should experience a left/right imbalance.
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I think the sharp curvature towards the left end of the needle also affects field strength (causing the droplet to be drawn closer and orbit faster). Same reason why lightning rods are spiked to disperse charge efficiently
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Replying to @NateArsenic @farkf and
Still wondering, though- what is causing its oscillations to max out and switch direction at a seemingly arbitrary spot on the right side of the needle? There seems to be no change in the needle at this point. Is it a point where forces equal 0, i.e. the midpoint of the needle?
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Well the orbit isn’t stable so I think the fact the gif is only a few seconds is somewhat deceiving
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