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Andre K. T. Assis
The Electric Force of a Current

Date: 2011-09-03 Time: 07:00 - 09:00 US/Pacific (7 years 6 months ago)
America/Los Angeles: 2011-09-03 07:00 (DST)
America/New York: 2011-09-03 10:00 (DST)
America/Sao Paulo: 2011-09-03 11:00
Europe/London: 2011-09-03 14:00
Asia/Colombo: 2011-09-03 19:30
Australia/Sydney: 2011-09-04 01:00 (DST)

Where: Online Video Conference
Recording Playback
This video conference used Fuzemeeting.
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Is there a force between a stationary resistive circuit carrying a steady current and a stationary charge outside the circuit? Does this circuit generate an electric field outside it? Is this wire with a DC current electrically neutral along its length? These are the main questions discussed in this presentation. It is presented the opinion of some scientists like Clausius and Feynman who believed there was no force between a charge and a circuit carrying a constant current when they were at rest relative to one another. It is shown theoretically and experimentally that this force is different from zero and that there is a distribution of surface charges along the closed circuit carrying a steady current. It is presented the potential and electric field outside this circuit in different geometries: a straight wire, a coaxial cable, a twin-lead, a solenoid and a ring. This history of this subject is briefly reviewed, including a discussion of the pioneering and revolutionary works of Wilhelm Weber and Gustav Kirchhoff.

- A. K. T. Assis, The Electric Force of a Current: Weber and the Surface Charges of Resistive Conductors Carrying Steady Currents (Apeiron, Montreal, 2007). Available in PDF format.