Physics for Scientists and Engineers
10th Edition
ISBN: 9781337553278
Author: Raymond A. Serway, John W. Jewett
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Textbook Question
Chapter 26, Problem 24P
The Van de Graaff generator, diagrammed in Figure P26.24, is an electrostatic device that can raise the metal dome to a high voltage. The dome of such a generator is seen on the left in Figure 22.1a. In the device, charge is delivered continuously to the high-potential dome by means of a moving belt of insulating material. The belt is charged at point Ⓐ by means of a discharge between comb-like metallic needles and a grounded grid. The needles are maintained at a positive electric potential of typically 104 V. The positive charge on the moving belt is transferred to the dome by a second comb of needles at point Ⓑ. Because the electric field inside the dome is negligible, the positive charge on the belt is easily transferred to the dome from its interior regardless of its potential. Suppose the generator is operating so that the potential difference between the high potential dome Ⓑ and the charging needles at Ⓐ is 15.0 kV. Calculate the power required to drive the belt against electrical forces at an instant when the effective current delivered to the dome is 500 μA.
Figure P26.24
Expert Solution & Answer
Trending nowThis is a popular solution!
Students have asked these similar questions
To repair a power supply for a stereo amplifier, an electronics technician needs a 100-μF capacitor capable of withstanding a potential difference of 90 V between the plates. The immediately available supply is a box of five 100-μF capacitors, each having a maximum voltage capability of 50 V. (a) What combination of these capacitors has the proper electrical characteristics? Will the technician use all the capacitors in the box? Explain your answers. (b) In the combination of capacitors obtained in part (a), what will be the maximum voltage across each of the capacitors used?
A research van de graaf generator has a 2.50 mm diameter sphere with a charge of 6.00 micro coulombs on it.
a) what is the potential near its surface?
b) At what distance from its center is the potential 1.50 MV?
Suppose you have a 9.3-V battery, a 1.8 μF capacitor, and a 7.8 μF capacitor.
(a) Find the charge and energy stored if the capacitors are connected to the battery in series.
Q = ?
E = ?
(b) Do the same for a parallel connection.
Q = ?
E = ?
Chapter 26 Solutions
Physics for Scientists and Engineers
Ch. 26.1 - Consider positive and negative charges of equal...Ch. 26.2 - Prob. 26.2QQCh. 26.2 - Prob. 26.3QQCh. 26.4 - When does an incandescent lightbulb carry more...Ch. 26 - Prob. 1PCh. 26 - A small sphere that carries a charge q is whirled...Ch. 26 - In the Bohr model of the hydrogen atom (which will...Ch. 26 - Prob. 4PCh. 26 - Prob. 5PCh. 26 - Figure P26.6 represents a section of a conductor...
Ch. 26 - The quantity of charge q (in coulombs) that has...Ch. 26 - A Van de Graaff generator (see Problem 24)...Ch. 26 - An electric current in a conductor varies with...Ch. 26 - Prob. 10PCh. 26 - An electric heater carries a current of 13.5 A...Ch. 26 - You are working at a company that manufactures...Ch. 26 - Prob. 13PCh. 26 - Prob. 14PCh. 26 - Prob. 15PCh. 26 - Prob. 16PCh. 26 - Prob. 17PCh. 26 - Prob. 18PCh. 26 - An aluminum wire with a diameter of 0.100 mm has a...Ch. 26 - Plethysmographs are devices used for measuring...Ch. 26 - At what temperature will aluminum have a...Ch. 26 - You are working in a laboratory that studies the...Ch. 26 - Assume that global lightning on the Earth...Ch. 26 - The Van de Graaff generator, diagrammed in Figure...Ch. 26 - A 100-W lightbulb connected to a 120-V source...Ch. 26 - The potential difference across a resting neuron...Ch. 26 - The cost of energy delivered to residences by...Ch. 26 - Residential building codes typically require the...Ch. 26 - Assuming the cost of energy from the electric...Ch. 26 - An 11.0-W energy-efficient fluorescent lightbulb...Ch. 26 - A 500-W heating coil designed to operate from 110...Ch. 26 - Why is the following situation impossible? A...Ch. 26 - Make an order-of-magnitude estimate of the cost of...Ch. 26 - Lightbulb A is marked 25 W 120 V, and lightbulb B...Ch. 26 - One wire in a high-voltage transmission line...Ch. 26 - You are working with an oceanographer who is...Ch. 26 - A charge Q is placed on a capacitor of capacitance...Ch. 26 - An experiment is conducted to measure the...Ch. 26 - Prob. 39APCh. 26 - Prob. 40APCh. 26 - Review. An office worker uses an immersion heater...Ch. 26 - The strain in a wire can be monitored and computed...Ch. 26 - A close analogy exists between the flow of energy...Ch. 26 - The dielectric material between the plates of a...Ch. 26 - Review. A parallel-plate capacitor consists of...Ch. 26 - Prob. 46APCh. 26 - Why is the following situation impossible? An...Ch. 26 - Prob. 48CPCh. 26 - A spherical shell with inner radius ra and outer...Ch. 26 - Material with uniform resistivity is formed into...
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- A charge Q is placed on a capacitor of capacitance C. The capacitor is connected into the circuit shown in Figure P26.37, with an open switch, a resistor, and an initially uncharged capacitor of capacitance 3C. The switch is then closed, and the circuit comes to equilibrium. In terms of Q and C, find (a) the final potential difference between the plates of each capacitor, (b) the charge on each capacitor, and (c) the final energy stored in each capacitor. (d) Find the internal energy appearing in the resistor. Figure P26.37arrow_forwardA detector that can measure radiation typically consists of a 25000 μm cylindrical metal tube, sealed at the ends with a 1000 μm diameter wire along its axis. The wire and cylinder are separated by a low-pressure gas whose dielectric strength is 1.0 x 106 V/m. a. What is the capacitance per unit length? b. What is the maximum potential difference between the wire and the tube?arrow_forwardA spherical capacitor is formed from two concentric spherical conducting shells separated by a vacuum. The inner sphere has radius 12.5 cm and the outer sphere has radius 14.8 cm. A potential difference of 120 V is appliedto the capacitor. (a) What is the energy density at r = 12.6 cm , just outside the inner sphere? (b) What is the energy density at r = 14.7 cm , just inside the outer sphere? (c) For the parallel-plate capacitor the energy density is uniform in the region between the plates, except near the edges of the plates. Is this also true for the spherical capacitor?arrow_forward
- #29: In Figure P21.29, the electric potential at point A is -300 V. What is the potential at point B, which is 5.0 cm to the right of A?arrow_forwarda) The network of capacitors shown in the image are all uncharged when a 364V potential is applied between points A and B with the switch S open. How much energy is stored in the network of capacitors? b) The network of capacitors shown in the image are all uncharged when a 185V potential is applied between points A and B with the switch S open. What is the voltage across the lower right 2.0µF capacitor when all of the capacitors are fully charged?arrow_forwardA research Van de Graaff generator has a 2.50 mm diameter sphere with a charge of 6.00 μC on it. A. What is the potential near its surface? B. At what distance from its center is the potential 1.50 MV?arrow_forward
- The girl in Figure 26.12 has her hand on the sphere of a Van de Graaffgenerator that is at a potential of 400,000 V. She is standing on an insulating platform, so no current flows through her. But what happens if she touches something that is grounded? Is she still safe? Figure P26.57 shows the equivalent circuit. CVDG = 20 pF represents the capacitance of the Van de Graaff sphere, Cgirl = 100 pF is the capacitance of the girl’sbody, and R = 5 kΩ is the resistance of her body, from one hand to the other. The switch is closed when she touches ground.a. What is the initial current at the instant the switch is closed?b. What is the time constant for the current to decay?c. Occupational safety experts have found that a shock is safe if the product of the voltage, the current, and the time the current is delivered is less than 13.5 V • A • s = 13.5. Estimate this product. Is this shock safe?arrow_forwarda . Discuss several factors that may limit the ability of acapacitor to store charge.b . Air is pumped from one metal tank to another,creating a partial vacuum in one tank and high pressurein the other. When the pump is removed, potentialenergy is stored. The energy is released if the two tanksare reconnected and the pressure in each tank becomesequal. In what ways is this mechanical exampleanalogous to charging and discharging a capacitor?arrow_forwardA 415nF air-filled parallel-plate capacitor stores 10.1μJ of energy when connected to a battery. The capacitor remains connected to the battery while an insulating material is inserted, completely filling the gap between the plates, and the stored energy increases by 35.7μJ. a. What is the voltage difference, in volts, provided by the battery? b. What is the dielectric constant of the insulating material that was inserted into the gap?arrow_forward
- A nervous physicist worries that the two metal shelves of his wood frame bookcase might obtain a high voltage if charged by static electricity, perhaps produced by friction. (a) What is the capacitance of the empty shelves if they have area 1.00 x 102 m2and are 0.200 m apart? (b) What is the voltage between them if opposite charges of magnitude 2.00 nC are placed on them? (c) Toshow that this voltage poses a small hazard, calculate the energy stored.arrow_forwardTwo 1.60-cm-diameter disks spaced 1.80 mm apart form a parallel-plate capacitor. The electric field between the disks is 5.20×105 V/m . A) What is the voltage across the capacitor? B) An electron is launched from the negative plate. It strikes the positive plate at a speed of 2.10×107 m/s . What was the electron's speed as it left the negative plate?arrow_forwarda. What is the potential energy stored in the electric fieldof a 200-μF capacitor when it is charged to a voltage of2400 V?b. What is the energy stored on a 25-μF capacitor whenthe charge on each plate is 2400 μC? What is the voltageacross the capacitor?c. How much work is required to charge a capacitor to a potential difference of 30kv if 800 μC is on each place?arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Physics for Scientists and Engineers with Modern ...PhysicsISBN:9781337553292Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
Physics for Scientists and EngineersPhysicsISBN:9781337553278Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning
Physics for Scientists and Engineers with Modern ...
Physics
ISBN:9781337553292
Author:Raymond A. Serway, John W. Jewett
Publisher:Cengage Learning
Physics for Scientists and Engineers
Physics
ISBN:9781337553278
Author:Raymond A. Serway, John W. Jewett
Publisher:Cengage Learning
Physics for Scientists and Engineers: Foundations...
Physics
ISBN:9781133939146
Author:Katz, Debora M.
Publisher:Cengage Learning
Physics Capacitor & Capacitance part 7 (Parallel Plate capacitor) CBSE class 12; Author: LearnoHub - Class 11, 12;https://www.youtube.com/watch?v=JoW6UstbZ7Y;License: Standard YouTube License, CC-BY