Lecture 15: Ampere's Law, Solenoids, Revisit the Kelvin Water Dropper, Midterm Evaluation

author: Walter H. G. Lewin, Center for Future Civic Media
recorded by: Massachusetts Institute of Technology, MIT
published: Oct. 10, 2008,   recorded: February 2002,   views: 3645
released under terms of: Creative Commons Attribution No Derivatives (CC-BY-ND)
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Reviews and comments:

Comment1 Evan Goldstein, May 6, 2011 at 7:38 p.m.:

As a 7th grade student at Salk School of Science in Manhattan, I decided to build a Kelvin water dropper as my exploritorium project. So far it works great! Our question is if a spark will discharge earlier when we use liquids with a wide range of acidity. I believe the liquids with higher acidity will discharge earlier, what do you think?


Comment2 angel, February 15, 2013 at 4:44 p.m.:

I was bothered by your comments that the two sides of the water would be 'randomly' charged. The ratio of water to heavy water is 1 to 7000, and because the source water will polarize, you will get more - out of the south source, or (or east if in that direction). It is the delta between the two streams that you are playing with.


Comment3 angel, February 15, 2013 at 5:31 p.m.:

I was bothered by your comments that the two sides of the water would be 'randomly' charged. The ratio of water to heavy water is 1 to 7000, and because the source water will polarize, you will get more out of the south source,(or east if in that direction). It is the delta between the two streams that you are playing with.

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