A high voltage transmission line with a diameter of 2 cm carries a steady current of 980 A. The conductor is copper with a free charge density of 8×1028 electrons/m3. If it takes 8×108 s for one electron to travel the full length of the cable, how long is the cable (in m)? (e = 1.6×10-19 C)

A high voltage transmission line with a diameter of 2 cm carries a steady current of 980 A. The conductor is copper with a free charge density of 8×1028 electrons/m3. If it takes 8×108 s for one electron to travel the full length of the cable, how long is the cable (in m)? (e = 1.6×10-19 C)

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter21: Current And Direct Current Circuits

Section: Chapter Questions

Problem 17P

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Concept explainers

Microscopic view of current

In physics, the term current is expressed as the rate of flow of electric charges across the area per unit time (I=q/t). It propagates along in the direction of the motion of positive charges. When the current is caused by the motion of electrons, the direction of the current is opposite to the flow.

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A high voltage transmission line with a diameter of 2 cm carries a steady current of 980 A. The conductor is copper with a free charge density of 8×10²⁸ electrons/m³.If it takes 8×10⁸ s for one electron to travel the full length of the cable, how long is the cable (in m)? (e = 1.6×10^-19 C)

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