A student uses a coil of radius 12 cm with 95 windings. a) Calculate the expected slope for a plot of magnetic field vs current in this coil. b) She performs the lab and measures a slope of 4.5 x 10^-4 T/A. Based on this slope, what value does she calculate for μo?

A student uses a coil of radius 12 cm with 95 windings. a) Calculate the expected slope for a plot of magnetic field vs current in this coil. b) She performs the lab and measures a slope of 4.5 x 10^-4 T/A. Based on this slope, what value does she calculate for μo?

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 38A

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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 student uses a coil of radius 12 cm with 95 windings.

a) Calculate the expected slope for a plot of magnetic field vs current in this coil.

b) She performs the lab and measures a slope of 4.5 x 10^-4 T/A. Based on this slope, what value does she calculate for μo?

c) Calculate the percent error between her measured value of μo and the theoretical value.

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