28.31 BIO Currents in the Brain. The magnetic field around the head has been measured to be approximately 3.0 pT. Although the cur- rents that cause this field are quite complicated, we can get a rough esti- mate of their size by modeling them as a single circular current loop 16 cm (the width of a typical head) in diameter. What is the current needed to produce such a field at the center of the loop?

28.31 BIO Currents in the Brain. The magnetic field around the head has been measured to be approximately 3.0 pT. Although the cur- rents that cause this field are quite complicated, we can get a rough esti- mate of their size by modeling them as a single circular current loop 16 cm (the width of a typical head) in diameter. What is the current needed to produce such a field at the center of the loop?

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

28.31 BIO Currents in the Brain. The magnetic field around the
head has been measured to be approximately 3.0 pT. Although the cur-
rents that cause this field are quite complicated, we can get a rough esti-
mate of their size by modeling them as a single circular current loop 16
cm (the width of a typical head) in diameter. What is the current needed
to produce such a field at the center of the loop?
28.33. Calculate the magnitude Figure E28.33
of the magnetic field at point P of
Fig. E28.33 in terms of R, 1₁, and
12. What does your expression give
when I₁ = 1₂?
R
R
P
11

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