How far from the starter cable of a car, carrying 150 A, must you be to experience a field less than the Earth’s (5.00×10−5 T)? Assume a long straight wire carries the current. (In practice, the body of your car shields thedashboard compass.)

How far from the starter cable of a car, carrying 150 A, must you be to experience a field less than the Earth’s (5.00×10−5 T)? Assume a long straight wire carries the current. (In practice, the body of your car shields thedashboard compass.)

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter12: Sources Of Magnetic Fields

Section: Chapter Questions

Problem 12.4CYU: 12.4 Check Your Understanding Two wires, both carrying current out of the page, have a current of...

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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

How far from the starter cable of a car, carrying 150 A, must you be to experience a field less than the Earth’s (5.00×10⁻⁵ T)? Assume a long straight wire carries the current. (In practice, the body of your car shields the
dashboard compass.)

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