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A Quantitative Version of Feynman's Static Field Momentum Example

Johns, Oliver Davis (2019) A Quantitative Version of Feynman's Static Field Momentum Example. [Preprint]

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Abstract

The Feynman demonstration that electromagnetic field momentum is real—even for static fields—can be made more useful by simplifying its geometry. Instead of Feynman's disk with charged balls on its surface, use a hollow non-conducting sphere with uniform surface charge density. The initial field angular momentum and the final mechanical angular momentum can then be calculated in closed form and shown to be equal. The methods used in the calculation are those available to the average upper-division physics student.

This simplified geometry also provides a test for the current idea that electromagnetic field energy can be considered a form of inertial mass. The mass motion in the simplified Feynman example can be modeled as the static, circular, incompressible flow of a fluid, with distributed
nonzero vorticity. But such motion requires a centripetal force or pressure that has yet to be identified.


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Item Type: Preprint
Creators:
CreatorsEmailORCID
Johns, Oliver Davisojohns@metacosmos.org0000-0003-4251-976X
Keywords: Feynman, Field Momentum, Relativity, Electromagnetic Mass
Subjects: Specific Sciences > Physics > Classical Physics
Specific Sciences > Physics > Fields and Particles
Specific Sciences > Physics
Specific Sciences > Physics > Relativity Theory
General Issues > Science Education
Depositing User: Prof. Oliver D. Johns
Date Deposited: 17 Nov 2019 18:31
Last Modified: 17 Nov 2019 18:31
Item ID: 16637
Subjects: Specific Sciences > Physics > Classical Physics
Specific Sciences > Physics > Fields and Particles
Specific Sciences > Physics
Specific Sciences > Physics > Relativity Theory
General Issues > Science Education
Date: 13 November 2019
URI: http://philsci-archive.pitt.edu/id/eprint/16637

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