he figure below shows a wire carrying a current I = 15.0 A to the right. Below the wire is a small metal washer with a radius of a = 0.250 cm. The washer, oriented vertically, is initially ouching the wire, and is then dropped from rest. The washer falls a distance h = 0.475 m before touching a table below. You may assume that the wire is very thin, and that the metal ring of he washer is thin compared to its radius. You may also assume the magnetic field is nearly constant over the area of the washer and equal to the magnetic field at the washer's center. (a) What is the magnitude of the average induced emf in the washer (in nV) over the time interval between its release and the moment it hits the table?

he figure below shows a wire carrying a current I = 15.0 A to the right. Below the wire is a small metal washer with a radius of a = 0.250 cm. The washer, oriented vertically, is initially ouching the wire, and is then dropped from rest. The washer falls a distance h = 0.475 m before touching a table below. You may assume that the wire is very thin, and that the metal ring of he washer is thin compared to its radius. You may also assume the magnetic field is nearly constant over the area of the washer and equal to the magnetic field at the washer's center. (a) What is the magnitude of the average induced emf in the washer (in nV) over the time interval between its release and the moment it hits the table?

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

Magnetic Field Of Coaxial Cable

The word coaxial means same axis. So for a long straight cable to be coaxial, it must have concentric cylindrical shaped conductor around it. Coaxial cable (popularly called ‘coax’) has various applications ranging from current conductors to radiofrequency signal transmitters. This cable has lower emission losses and provides protection from electromagnetic interference which allows signals with less power to transmit over longer distances.For example, currents produced in the pickup of a stereo turntable generally travel to the amplifier through a coaxial cable.The self-inductance of a coaxial cable is another important characteristic, because it influences the propagation of electrical signals in the cable.

Question

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The figure below shows a wire carrying a current I = 15.0 A to the right. Below the wire is a small metal washer with a radius of a = 0.250 cm. The washer, oriented vertically, is initially
touching the wire, and is then dropped from rest. The washer falls a distance h = 0.475 m before touching a table below. You may assume that the wire is very thin, and that the metal ring of
the washer is thin compared to its radius. You may also assume the magnetic field is nearly constant over the area of the washer and equal to the magnetic field at the washer's center.
(a) What is the magnitude of the average induced emf in the washer (in nV) over the time interval between its release and the moment it hits the table?
What is the magnitude of the magnetic field due to a long wire? What is the initial distance between the wire and the center of the washer? The final distance? What are the initial and final
flux values? How long does it take the washer to fall the distance h? How is the change in flux related to the average emf? nV

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