Physics of Everyday Phenomena
9th Edition
ISBN: 9781259894008
Author: W. Thomas Griffith, Juliet Brosing Professor
Publisher: McGraw-Hill Education
expand_more
expand_more
format_list_bulleted
Videos
Textbook Question
Chapter 14, Problem 29CQ
Under which conditions are inductive detectors more effective than simple timer systems—when the traffic is heavy in all directions at all times or when the traffic varies with time of day and other factors? Explain. (See everyday phenomenon box 14.2.)
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
Why are the armature and field windings of an electric motor usually wound on an iron core?
Q4 . In Figure 4, a rod of length L=0.1 m is forced to move along horizontal rails at a constant speed v =5.00 m/s. The rod and rails form a conducting loop with the connecting strip at the right. The rod is known to have a resistance 0.4 92, rest of the loop has negligible resistance. The conducting loop is placed into a magnetic field generated by the long straight wire at distance a=0.01 m from the loop. Find the magnitude of the force that must be applied externally on the rod to make it moving with constant speed.
A jet develops a 0.25 volt potential difference between the tips of its wings when flying above a region of the earth where the earth's magnetic field points essentially vertically upward. If the jet's wingspan is 35 meters, what is its speed?
(Hint: The answer is 143 m/s)
Chapter 14 Solutions
Physics of Everyday Phenomena
Ch. 14 - The north pole of a handheld bar magnet is brought...Ch. 14 - If the distance between the south poles of two...Ch. 14 - In what respects is the force between two magnetic...Ch. 14 - Is it possible for a bar magnet to have just one...Ch. 14 - Does a compass needle always point directly...Ch. 14 - If we regard the Earth as a magnet, does its...Ch. 14 - We visualized the magnetic field of the Earth by...Ch. 14 - A horizontal wire is oriented along a north-south...Ch. 14 - A horizontal wire is oriented along an east-west...Ch. 14 - Is the force exerted by one current-carrying wire...
Ch. 14 - A uniform magnetic field is directed horizontally...Ch. 14 - A positively charged particle is momentarily at...Ch. 14 - If a uniform magnetic field is directed...Ch. 14 - Why does the magnetic force on a current-carrying...Ch. 14 - If we look down at the top of a circular loop of...Ch. 14 - If we were to represent the current loop of...Ch. 14 - A current-carrying rectangular loop of wire is...Ch. 14 - If the rectangular loop of wire shown in question...Ch. 14 - Because the magnetic fields of a coil of wire and...Ch. 14 - In what respect is a simple ammeter designed to...Ch. 14 - Does an ac motor require a split-ring commutator...Ch. 14 - Which type of motor typically runs at a fixed...Ch. 14 - If Faraday wound enough turns of wire on the...Ch. 14 - Is a magnetic flux the same as a magnetic field?...Ch. 14 - A horizontal loop of wire has a magnetic field...Ch. 14 - Suppose the magnetic flux through a coil of wire...Ch. 14 - Two coils of wire are identical except that coil....Ch. 14 - Do the sensors that detect vehicles at stoplights...Ch. 14 - Under which conditions are inductive detectors...Ch. 14 - If the magnetic field produced by the magnets in a...Ch. 14 - Does a simple generator produce a steady direct...Ch. 14 - A simple generator and a simple electric motor...Ch. 14 - Can a transformer be used, as shown in the...Ch. 14 - By stepping up the voltage of an...Ch. 14 - Prob. 1ECh. 14 - Two long parallel wires, each carrying a current...Ch. 14 - Prob. 3ECh. 14 - Prob. 4ECh. 14 - A wire carries a current of 12 A. How much charge...Ch. 14 - A particle with a charge of 0.6 C is moving at...Ch. 14 - A straight segment of wire has a length of 12 cm...Ch. 14 - The magnetic force on a 60-cm straight segment of...Ch. 14 - A coil of wire with 150 turns has a...Ch. 14 - A loop of wire enclosing an area of 0.04 m2 has a...Ch. 14 - The magnetic flux through a coil of wire changes...Ch. 14 - A coil of wire with 120 turns and a...Ch. 14 - Prob. 13ECh. 14 - If 15 A of current are supplied to the primary...Ch. 14 - Prob. 15ECh. 14 - Prob. 16ECh. 14 - Two long parallel wires carry currents of 8 A and...Ch. 14 - A small metal ball with a charge of +0.08 C and a...Ch. 14 - A rectangular coil of wire has dimensions of 4 cm...Ch. 14 - Prob. 4SP
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
- Materials that have capability of becoming stronger magnets have low permiability and high relluctance ligh permiability and high relluctance high permiability and low relluctance low permiability and low relluctance none of thesearrow_forward(a) The hot and neutral wires supplying DC power to a light-rail commuter train carry 800 A and are separated by 7.50 cm. What is the magnitude and direction of the force between 50.0 m of these wires? (b) Discuss the practical consequences of this force, if any.arrow_forwardThree long, current-carrying wires are parallel to one another and separated by a distance d. The magnitudes and directions of the currents are shown in Figure P30.91. Wires 1 and 3 are fixed, but wire 2 is free to move. Wire 2 is displaced to the right by a small distance x. Determine the net force (per unit length) acting on wire 2 and the angular frequency of the resulting oscillation. Assume the mass per unit length of wire 2 is and x d. FIGURE P30.91arrow_forward
- (a) A dc power line for a light-rail system caries 1000 A at an angle of 30.0 to Earth's 5.0105 T field, What is the force on a 100-m section of this line? (b) Discuss practical concerns this presents, if any.arrow_forwardUnreasonable Results Frustrated by the small Hall voltage obtained in blood flow measurements, a medical physicist decides to increase the applied magnetic field strength to get a 0.500V output for blood moving at 30.0 cm/s in a 1.50cmdiameter vessel. (a) What magnetic field strength is needed? (b) What is unreasonable about this result? (c) Which premise is responsible?arrow_forwardUnreasonable Results A surveyor 100 m from a long straight 200-kV DC power line suspects that its magnetic field may equal that of the Earth and affect compass readings. (a) Calculate the current in the wire needed to create a 5.00105T field at this distance. (b) What is unreasonable about this result? (c) Which assumption or premise is responsible?arrow_forward
- Starting with emf2=MI1t, show that the units of inductance are (Vs)/A=s.arrow_forward(a) A DC power line for a light-rail system carries 1000 A at an angle of 30.0° to the Earth’s 5.00105-T field. What is the force on a 100-m section of this line? (b) Discuss practical concerns this presents, if any.arrow_forwardA current of 1.5 A flows through the windings of a large, thin toroid with 200 turns per meter. If the toroid is filled with iron for which =3.0103 , what is the magnetic field within it?arrow_forward
- Is Ampere’s law valid for all closed paths? Why isn’t it normally useful for calculating a magnetic field?arrow_forwardHall potentials are much larger for poor conductors than for good conductors. Why?arrow_forwardReview. In Figure P30.42, a uniform magnetic field decreases at a constant rate dB/dt = K, where K is a positive constant. A circular loop of wire of radius a containing a resistance R and a capacitance C is placed with its plane normal to the field. (a) Find the charge Q on the capacitor when it is fully charged. (b) Which plate, upper or lower, is at the higher potential? (c) Discuss the force that causes the separation of charges. Figure P30.42arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Principles of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
College PhysicsPhysicsISBN:9781938168000Author:Paul Peter Urone, Roger HinrichsPublisher:OpenStax College
College PhysicsPhysicsISBN:9781285737027Author:Raymond A. Serway, Chris VuillePublisher:Cengage Learning
College PhysicsPhysicsISBN:9781305952300Author:Raymond A. Serway, Chris VuillePublisher:Cengage Learning
Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning
Principles of Physics: A Calculus-Based Text
Physics
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Cengage Learning
College Physics
Physics
ISBN:9781938168000
Author:Paul Peter Urone, Roger Hinrichs
Publisher:OpenStax College
College Physics
Physics
ISBN:9781285737027
Author:Raymond A. Serway, Chris Vuille
Publisher:Cengage Learning
College Physics
Physics
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Cengage Learning
Physics for Scientists and Engineers: Foundations...
Physics
ISBN:9781133939146
Author:Katz, Debora M.
Publisher:Cengage Learning
What is Electromagnetic Induction? | Faraday's Laws and Lenz Law | iKen | iKen Edu | iKen App; Author: Iken Edu;https://www.youtube.com/watch?v=3HyORmBip-w;License: Standard YouTube License, CC-BY