27. Resistors & DC Circuits
Microscopic View of Current
11:28 minutes
Problem 25.57
Textbook Question
Textbook Question(II) At a point high in the Earth’s atmosphere, He²⁺ ions in a concentration of 2.8 x 10¹²/m³ are moving due north at a speed of 2.0 x 10⁶ m/s. Also, a 7.0 x 10¹¹ / m³ concentration of O⁻₂ ions is moving due south at a speed of 6.2 x 10⁶ m/s . Determine the magnitude and direction of the current density j→ at this point.
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