Concept explainers
You are working for a company that manufactures motors and generators. At the end of your first day of work, your supervisor explains to you that you will be assigned to a team that is designing a new homopolar generator. You have no idea what that is, but agree wholeheartedly to the assignment. At home that evening, you go online to learn about the homopolar generator and find the following. The homopolar generator, also called the Faraday disk, is a low-voltage, high-current electric generator. It consists of a rotating
Figure P30.17
Trending nowThis is a popular solution!
Chapter 30 Solutions
EBK PHYSICS FOR SCIENTISTS AND ENGINEER
- Please answer each question with all requirements.arrow_forwardYou may want to review (Page 796). For help with math skills, you may want to review: The Vector Cross Product 1 The Vector Cross Product 2 Figure P 1 of 1 Part A What is the strength of the magnetic field at point P in the figure? (Figure 1) Assume that I = 6.0 A, T1 = 1.1 cm, and r2 = 2.2 cm. Express your answer to two significant figures and include the appropriate units. B = 1 Submit Part B μà Value Request Answer Submil into the screen out of the screen What is the direction of the magnetic field at point P in the figure? Previous Answers Correct Units B ?arrow_forwardA conducting rod slides on two parallel conducting bars as shown below. The bars are connected through a 10 ohm resistor which has a voltmeter attached across it. The bars are separated by .15m in the y direction. A force F is applied to therod to keep the rodmoving in the x direction at constant speed of v=6m/s. A uniform B-field of B=3mT is perpendicular to the x-y plane and points into the page as shown. R= 3mT とミ/Sm R= 10L IN a) Determine the magnetic flux D(x) as a function of x. b) Calculate d®/dt in Wb/s c) Determine the magnitude of EMF measured by the voltmeter. d) Calculate the current through the resistor and its direction (CW or CCW). e) Determine the magnitude of the force required to pull rod. f) Determine the energy density stored in the B-field.arrow_forward
- Investigators are researching the appearance of a strange movement of objects in what the local community considers a haunted house. The owners of the house attribute the cause to poltergeists; others blame overly‑strong magnetic fields. As a scientific investigator of paranormal claims, you decide to investigate. You will start by focusing on magnetic fields. Paranormal skeptics use other equipment to investigate claims of ghosts and poltergeists, such as video and audio recorders. Using a coil made of 219 turns219 turns of single‑strand copper wire, you use a motor to rotate the coil at a constant angular speed of 60.0 rev/s60.0 rev/s at various orientations and locations throughout the room. In one particularly significant orientation, you notice a maximum induced voltage of 2.15 V2.15 V appearing in the coil. If the radius of the coil is 1.00 cm,1.00 cm, how strong was the magnetic field that produced this emf? strength of the magnetic field:arrow_forwardInvestigators are researching the appearance of a strange movement of objects in what the local community considers a haunted house. The owners of the house attribute the cause to poltergeists; others blame overly‑strong magnetic fields. As a scientific investigator of paranormal claims, you decide to investigate. You will start by focusing on magnetic fields. Paranormal skeptics use other equipment to investigate claims of ghosts and poltergeists, such as video and audio recorders. Using a coil made of 117 turns of single‑strand copper wire, you use a motor to rotate the coil at a constant angular speed of 80.0 rev/s at various orientations and locations throughout the room. In one particularly significant orientation, you notice a maximum induced voltage of 4.15 V appearing in the coil. If the radius of the coil is 1.00 cm, how strong was the magnetic field that produced this emf? strength of the magnetic field: T Can you rule out the possibility that unusually…arrow_forwardA 144-Ω light bulb is connected to a conducting wire that is wrapped into the shape of a square with side length of 83.0 cm. This square loop is rotated within a uniform magnetic field of 454 mT. What is the change in magnetic flux through the loop when it rotates from a position where its area vector makes an angle of 30° with the field to a position where the area vector is parallel to the field? The loop rotates from a position where its area vector makes an angle of 30° with the field to a position where the area vector is parallel to the field in 56.3 ms. What is the induced current through the light bulb? This square loop is rotated with a frequency of 60 Hz within a uniform magnetic field of 454 mT. This means the loop makes half a revolution in 8.33 ms. What is the induced current in the light bulb when the loop rotates from a position where its area vector is opposite the magnetic field to a position where its area vector is parallel to the magnetic field?arrow_forward
- Consider a wheel with four spokes as shown below. The radius of wheel is r = 0.21 m. The mass of the circumferential part is 0.6 kg, and the mass of each spoke is 0.19 kg. If one of the spokes is removed, calculate the distance (in mm) between the old and new center of mass locations. rarrow_forwardYou are working for a company that creates special magnetic environments. Your new supervisor has come from the financial side of the organization rather than the technical side. He has promised a client that the company can provide a device that will create a magnetic field inside a cylindrical chamber that is directed along the cylinder axis at all points in the chamber and increases in the axial direction as the square of the value of y, where y is the in the axial direction and y = 0 is at the bottom end of the cylinder. Prepare a calculation to show that the field requested by your supervisor and promised to a client is impossible.arrow_forwardThe figure shows two closed paths wrapped around two conducting loops carrying currents i = 6.4 A and iz = 3.6 A. What is the value of the integral B ds for (a) path 1 and (b) path 2? D2arrow_forward
- According to the information. Can you solve the problem?arrow_forwardA thin dielectric disk with radius a has a total charge +Q distributed uniformly over its surface (Figure 1). It rotates n times per second about an axis perpendicular to the surface of the disk and passing through its center. Find the magnetic field at the center of the disk. What magnetic field does this ring produce at the center of the disk? Express your answer in terms of the variables Q, a, r, dr, n, and the constant and µ0, if needed. Dielectric disk. radius a. charge +Q Ring, inner radius r. outer radius r + dr n rotations per second a Bat center of disk?arrow_forward6. Three long, straight wires are mounted on the vertices of an equilateral triangle as shown in the figure. The wires carry currents of I1 = 9.50 A, I2 = 6.50 A, and I3 = 7.00 A. Each side of the triangle has a length of 32.0 cm, and the point (B) is located half way between (I2) and (I3) along one of the sides. Find the magnitude of the magnetic field at point (B). Tarrow_forward
- Physics for Scientists and EngineersPhysicsISBN:9781337553278Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningPhysics for Scientists and Engineers with Modern ...PhysicsISBN:9781337553292Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningPrinciples of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage LearningCollege PhysicsPhysicsISBN:9781938168000Author:Paul Peter Urone, Roger HinrichsPublisher:OpenStax College