A long, straight wire with a circular cross section of radius K carries a current 1. Assume that the current density hot constant across the cross section of the wire, but rather varies as J = ar where a is a constant. What is the magnitude of the magnetic field B(r) for r ≤ R? Ο Α. Β = μια 8R Ο Β. Β = μια O C. B = Hoa K OD. B = μ₁α

A long, straight wire with a circular cross section of radius K carries a current 1. Assume that the current density hot constant across the cross section of the wire, but rather varies as J = ar where a is a constant. What is the magnitude of the magnetic field B(r) for r ≤ R? Ο Α. Β = μια 8R Ο Β. Β = μια O C. B = Hoa K OD. B = μ₁α

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

A long, straight wire with a circular cross section of radius R carries a current I. Assume that the current density is
not constant across the cross section of the wire, but rather varies as J = ar where a is a constant. What is the magnitude
of the magnetic field B(r) for r ≤ R?
Ο A. B = μια 8R
B. B = μα
O C. B
D.
O
=
B: = μοα
Moα R²
비침 비침 비침
R³
3r

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