When a steady current, I, is flowing through a conductor (e.g. the carbon paper here) with a non-negligible resistance, R, it will be possible to maintain a potential difference, ∆V = IR, between parts of the conductor along the direction of the current. Explain why in this situation there should be an electric field in the direction of the current but not in the direction perpendicular to the

University Physics Volume 2
18th Edition
ISBN:9781938168161
Author:OpenStax
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Chapter9: Current And Resistance
Section: Chapter Questions
Problem 83CP: A particle accelerator produces a beam with a radius of 1.25 mm with a current of 2.00 mA. Each...
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When a steady current, I, is flowing through a conductor (e.g. the carbon paper here) with a non-negligible resistance, R, it will be possible to maintain a potential difference, ∆V = IR, between parts of the conductor along the direction of the current. Explain why in this situation there should be an electric field in the direction of the current but not in the direction perpendicular to the current. 

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