Concept explainers
A current is established in a gas discharge tube when a sufficiently high potential difference is applied across the two electrodes in the tube. The gas ionizes; electrons move toward the positive terminal and singly charged positive ions toward the negative terminal. (a) What is the current in a hydrogen discharge tube in which 3.1 × 1018 electrons and 1.1 × 1018 protons move past a cross-sectional area of the tube each second? (b) Is the direction of the current density toward or away from the negative terminal?
Trending nowThis is a popular solution!
Chapter 26 Solutions
FUNDAMENTALS OF PHYSICS - EXTENDED
Additional Science Textbook Solutions
Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (4th Edition)
Conceptual Physical Science (6th Edition)
Essential University Physics (3rd Edition)
Cosmic Perspective Fundamentals
EBK FUNDAMENTALS OF THERMODYNAMICS, ENH
Physics for Scientists and Engineers with Modern Physics
- An aluminum wire 1.628 mm in diameter (14-gauge) carries a current of 3.00 amps, (a) What is the absolute value of the charge density in the wire? (b) What is the drift velocity of the electrons? (c) What would be the drift velocity if the same gauge copper were used instead of aluminum? The density of copper is 8.96 g/cm3 and thedensity of aluminum is 2.70 g/cm3. The molar mass ofaluminum is 26.98 g/mol and the molar mass of copper is 63.5 g/mol. Assume each atom of metal contributes one free electron.arrow_forwardTwo concentric, metal spherical shells of radii a = 4.0 cm and b = 8.0 cm are separated by aluminum as shown in Figure P28.33. The inner sphere has a total charge Q at any time. If the two spheres are maintained at a potential difference of 2.0 V via an external source, calculate the current from one sphere to the other.arrow_forwardQ. A silver wire 2.6 mm in diameter transfers a charge of 420 C in 80 min. Silver contains 5.8x10283 free electrons per cubic meter. What is the magnitude of the drift velocity (in x 10-6 m/s) of the electrons in the wire? (e = 1.60 x 10-19C) A D 1.78 2.78 3.36 4.50 5.30arrow_forward
- A cell phone battery uses chemistry to create a charge separation between the terminals (anode and cathode). Such a battery is listed as having a capacity of Q = 8.5E-08 C. Part (a) How many free electrons does the battery contain, N? N = Part (b) If there are 1.0 million electrons moving through the phone every second how long will the battery last in seconds? t = Part (c) Current, I, is given in amps which are coulombs per second. What is the current passing through the phone? I =arrow_forwardA conductor has a cross-sectional area of 2.3×10 6 m² and the number of free electrons per unit volume is 8.5x 1028 electron/m³. When the current is 10.5 A, find the drift speed (in mm/s) of the electrons. Use the charge of the electron to be 1.6x 10-19 C. Select one: O A. 0.34 O B. 44.07 OC. 0.44 OD. 0.23 OE. 33.57 Next pagearrow_forwardSilver wire has a cross-sectional area A = 2.0 mm2. A total of 9.4 x 10 electrons pass through the wire in 3.0 s. The conduction electron density in silver is 5.8 x 1028 electrons/m. What is the drift velocity of these electrons?arrow_forward
- A silver wire 5 mm in diameter transfers a charge of 320-C in 70 minutes. Silver contains 5.8x1028 free electrons per cubic meter. Determine the drift velocity (um2/s) of the electrons in the wire.arrow_forwardA potential difference of 3.00 nV is set up across a 2.00 cm length of copper wire that has a radius of 2.00 mm. How much charge drifts through a cross section in 3.00 ms?arrow_forwardElectrons flow through a 3.0-mm-diameter aluminum wire at 1.8×10−4 m/s. How many electrons move through a cross section of the wire each day?arrow_forward
- A conductor has a cross-sectional area of 2.3x106 m² and the number of free electrons per unit volume is 8.5 X1028 electron/m³. When the current is 6.4 A, find the drift speed (in mm/s) of the electrons. Use the charge of the electron to be 1.6×10-19 c. Select one: A. 0.20 B. 26.86 C. 0.14 D. 20.46 E. 0.27arrow_forwardA cell phone contains a battery rated at 2600 mA # h = 2.60 A # h. How many electrons can this battery supply to thephone?arrow_forwardIf 5.0 × 1021 electrons pass through a 44.7 Q resistor in 10 min, what is the potential difference across the resistor? use the charge of the electron to be -1.6 × 10-19 C.arrow_forward
- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage LearningPrinciples of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
- Physics for Scientists and Engineers with Modern ...PhysicsISBN:9781337553292Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning