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

author: Walter H. G. Lewin, Center for Future Civic Media, Massachusetts Institute of Technology, MIT
recorded by: Massachusetts Institute of Technology, MIT
published: Oct. 10, 2008,   recorded: February 2002,   views: 31919
released under terms of: Creative Commons Attribution Non-Commercial Share Alike (CC-BY-NC-SA)
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1 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?

2 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.

3 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.

4 jdae, October 16, 2015 at 2:54 p.m.:

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