12:06Current from drift velocity (I = neAvd) | Electricity | Physics | Khan AcademyKhan Academy India - English1522views
12:25Drift velocity (concept & intuition) | Electricity | Physics | Khan AcademyKhan Academy India - English449views
Multiple ChoiceTypical household wiring in the United States is 14-gauge copper wire. 14-gauge wire has a radius of 0.815mm. What is the electron drift speed if a 10A current is carried in a 14-gauge wire?532views
Multiple ChoiceWhat is the current density in a wire with a radius of 0.815mm carrying a current of 5.0A?368views
Multiple ChoiceWhat current does a 0.23V/m electric field create in an iron wire of 0.8mm mm radius?300views
Multiple ChoiceWhat is the electron current in a gold wire with a radius of 1.5mm when the electron drift speed is 1.0×10−4m/s?308views
Textbook QuestionPure silicon at room temperature contains approximately 1.0 * 10^16 free electrons per cubic meter. (a) Referring to Table 25.1, calculate the mean free time t for silicon at room temperature. (b) Your answer in part (a) is much greater than the mean free time for copper given in Example 25.11. Why, then, does pure silicon have such a high resistivity compared to copper?262views
Textbook QuestionThe two wires in FIGURE P27.63 are made of the same material. What are (b) the electron drift speed in the 2.0-mm-diameter segment of the wire?129views
Textbook QuestionThe electron drift speed is 2.0 X 10⁻⁴ m/s in a metal with a mean time between collisions of 5.0 x 10⁻¹⁴ . What is the electric field strength?138views
Textbook Question(II) A 0.65-mm-diameter copper wire carries a tiny current of 3.2 μA. Estimate(a) the electron drift speed,65views
Textbook Question(II) A 0.65-mm-diameter copper wire carries a tiny current of 3.2 μA. Estimate(b) the current density, and70views
Textbook Question(II) A 0.65-mm-diameter copper wire carries a tiny current of 3.2 μA. Estimate(c) the electric field in the wire.5views
Textbook Question(II) A 5.30-m length of 2.0-mm-diameter wire carries a 750-mA current when 22.0 mV is applied to its ends. If the drift speed is 1.7 x 10⁻⁵ m/s, determine(b) the resistivity ρ,64views
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.56views
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