A wire with a cross-sectional area A and length L is carrying a current I. The wire is placed in a perpendicular magnetic field B. The field is adjusted so as to exactly cancel the weight of the wire. Derive an expression for the mass density ρ of the wire.

A wire with a cross-sectional area A and length L is carrying a current I. The wire is placed in a perpendicular magnetic field B. The field is adjusted so as to exactly cancel the weight of the wire. Derive an expression for the mass density ρ of the wire.

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter26: Electromagnetism

Section: Chapter Questions

Problem 6STP

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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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