Find the current in a long straight wire that would produce a magnetic field twice the strength of the Earth's at a distance of 5.0 cm from the wire. The Earth's field is about 5.0 x 10-5T, and so here B due to the wire is taken to be 1.0 x 10-4 T.

Find the current in a long straight wire that would produce a magnetic field twice the strength of the Earth's at a distance of 5.0 cm from the wire. The Earth's field is about 5.0 x 10-5T, and so here B due to the wire is taken to be 1.0 x 10-4 T.

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter11: Magnetic Forces And Fields

Section: Chapter Questions

Problem 81AP: A 5.0-m section of a long, straight wire carries a current of 10 A while in a uniform magnetic field...

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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.

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Find the current in a long straight wire that would produce a magnetic field twice the
strength of the Earth's at a distance of 5.0 cm from the wire. The Earth's field is
about 5.0 x 10-5 T, and so here B due to the wire is taken to be 1.0 × 10-4 T.
Use the equation:
I = 2TrB
TO

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