A vertical narrow tube carries continuous flows of 101 protons per second upwards and 10²3 electrons per second downwards. Calculate the current in Ampere with respect to the direction "downwards".
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- The density of free electrons in a cylindrical metal wire is 7x10-8 m. The diameter d= 12.23 mm and carrying a current of I- 6.93 A. the drift velocity (in jum/s) of the electrons in the wire must be (charge of electron =1.6x10"19 C)A current of 9.50 A flows in a conductor for 6.0 s. How much charge passes a given point in the conductor during this time?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?
- A beam contains 2.7 × 109 doubly charged positive ions per cubic centimeter, all of which are moving north with a speed of 4.0 × 105 m/s. What is (a) the magnitude of the current densityA current of 82.8 mA exists in a metal wire. (a) How many electrons flow past a given cross section of the wire in 11.0 min? electrons (b) In what direction do the electrons travel with respect to the current? same direction The magnitude is zero. opposite directionThere is a net passage of 5.1 1018 electrons by a point in a wire conductor in 0.26 s. What is the current in the wire?
- A 290-km-long high-voltage transmission line 2.0 cm in diameter carries a steady current of 1,150 A. If the conductor is copper with a free charge density of 8.5 1028 electrons per cubic meter, how many years does it take one electron to travel the full length of the cable? (Use 3.156 107 for the number of seconds in a year.)How much charge passes a given point in a conductor when a current of 10 A flows for 25 seconds ?