01:59The Electric Battery and Conventional Current - Introduction to Basic ElectricityThe Organic Chemistry Tutor312views
Multiple ChoiceA lightning bolt hits the ground carrying a current of 3 × 104 A. If the strike lasts 50 ms, how much charge enters the ground?992views31rank4comments
Multiple ChoiceA wire is connected to the positive and negative plates of a capacitor. Electrons in the wire feel an attraction toward the positive plate of a capacitor, and a repulsion from the negative plate. What is true about the motion of these electrons?299views
Textbook QuestionAn aluminum wire consists of the three segments shown in FIGURE P27.64. The current in the top segment is 10 A. For each of these three segments, find the b. Current density J. Place your results in a table for easy viewing.276views
Textbook QuestionLightning occurs when there is a flow of electric charge (principally electrons) between the ground and a thundercloud. The maximum rate of charge flow in a lightning bolt is about 20,000 C/s; this lasts for 100 ms or less. How much charge flows between the ground and the cloud in this time? How many electrons flow during this time?1437views3rank
Textbook QuestionA linear accelerator uses alternating electric fields to accelerate electrons to close to the speed of light. A small number of the electrons collide with a target, but a large majority pass through the target and impact a beam dump at the end of the accelerator. In one experiment the beam dump measured charge accumulating at a rate of −2.0 nC/s. How many electrons traveled down the accelerator during the 2.0 h run?174views
Textbook Question(I) A current of 1.75 A flows in a wire. How many electrons are flowing past any point in the wire per second?70views
Textbook Question(II) What is the current in amperes if 1200 Na⁺ ions flow across a cell membrane in 2.8 μs? The charge on the sodium is the same as on an electron, but positive.75views
Textbook QuestionThe LHC accelerator at CERN (Switzerland) is designed to carry a 0.58-A beam of protons ( q = 1.6 x 10⁻¹⁹ C ) traveling at very nearly the speed of light ( 3.0 x 10⁸ m/s) around a ring 27 km in circumference. How many protons are in the beam?
Textbook QuestionFor the wire in Fig. 25–38, whose diameter varies uniformly from a to b as shown, suppose a current I = 2.5 A enters at a. If a = 2.5 mm and b = 4.0 mm, what is the current density (assume uniform) at each end? <IMAGE>66views
Textbook QuestionA strip of silicon 1.8 cm wide and 1.0 mm thick is immersed in a magnetic field of strength 1.3 T perpendicular to the strip (Fig. 40–53). When a current of 0.28 mA is run through the strip, there is a resulting Hall effect voltage of 18 mV across the strip (Section 27–8). How many electrons per silicon atom are in the conduction band? The density of silicon is 2330 kg/m³.<IMAGE>
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