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MIT 8.02 Electricity and Magnetism, Spring 2002 23 Online
OpenStudy (anonymous):

Hi, there. I saw a device consisting of 4 conductive cans with water flowing down through the two top ones and resulting in a spark between the bottom ones. What's its mechanism to generate the potential difference? Where can i find it?

OpenStudy (anonymous):

Lecture 10: Batteries and EMF at 44:10

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