A 5.00 A current runs through a 12 gauge copper wire (diameter2.05 mm) and through a light bulb. Copper has 8.5 * 10^28 free electronsper cubic meter. At what speed does a typical electron pass by any given point in the wire?
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A 5.00 A current runs through a 12 gauge copper wire (diameter
2.05 mm) and through a light bulb. Copper has 8.5 * 10^28 free electrons
per cubic meter. At
what speed does a typical electron pass by any given point in the wire?
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- 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?You have a battery marked "6.00 V." When you draw a current of 0.387 Afrom it, the potential difference between its terminals is 5.25 V. What is the potential difference Δ? when you draw 0.583 A?Under the influence of a constant E field of 700.0 N/C; 4.53* 1016 electrons pass through a 5.00 cm piece of wire in 5.00 seconds. a) What is the potential difference across the wire? b) What is the average current during this time period? c) What is the average power during this time? d) What is the effective resistance of the wire?
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- A lightning rod on top of a building consists of an iron spike 1.5 m long with a circular crosssection of diameter 1.5 cm. During a lightning strike, the rod carries a current of 1000 A. What is the potential difference across the rod when this current flows? The resistivity of iron is 1.0 x 10-7 Ωm.Consider a steady beam of protons. Each proton has kinetic energy 20 MeV. The beam represents a current of 0.25 μA. a) What is the potential difference through which the protons are accelerated? b) If the beam is directed perpendicular to a flat surface, how many protons strike the surface in 3 seconds?A high-voltage copper transmission line with a diameter of 2.60 cm and a length of 100 km carries a steady current of 8.50 x 10² A. If copper has a free charge density of 8.46 x 1028 electrons/m³, over what time interval does one electron travel the full length of the line? yr