A permalloy magnet is 1.0 cm in diameter, 30 cm long, andhas the magnetization ? = 1.5 · 104 A/m at its pole. How many turnsmust an empty solenoid of the same dimensions have to give rise to thesame magnetic field if it carries a current of 7.5 A?

A permalloy magnet is 1.0 cm in diameter, 30 cm long, andhas the magnetization ? = 1.5 · 104 A/m at its pole. How many turnsmust an empty solenoid of the same dimensions have to give rise to thesame magnetic field if it carries a current of 7.5 A?

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter12: Sources Of Magnetic Fields

Section: Chapter Questions

Problem 26P: The two long, parallel wires shown in the accompanying figure carry currents in the same direction....

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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 permalloy magnet is 1.0 cm in diameter, 30 cm long, and
has the magnetization ? = 1.5 · 104 A/m at its pole. How many turns
must an empty solenoid of the same dimensions have to give rise to the
same magnetic field if it carries a current of 7.5 A?

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