We have 5x10¹6 doubly charged positive ions (q=2e) per m³, all moving west with a speed 105 m/s. In the same region there are 10¹7 electrons per m³ moving northeast with a speed 106 m/s. What are the magnitude and direction of the current density ?

We have 5x10¹6 doubly charged positive ions (q=2e) per m³, all moving west with a speed 105 m/s. In the same region there are 10¹7 electrons per m³ moving northeast with a speed 106 m/s. What are the magnitude and direction of the current density ?

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 6P: Figure P21.6 represents a section of a conductor of nonuniform diameter carrying a current of I =...

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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.

Question

We have 5x10¹6 doubly charged positive ions (q=2e) per m³, all moving west with a speed
10³ m/s. In the same region there are 10¹7 electrons per m³ moving northeast with a speed 106
m/s. What are the magnitude and direction of the current density j?

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