Monday, September 2, 2024

The electromagnetic action cannot handle different charges?

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UPDATE September 7, 2024: We have a conceptual sign error here. The value of the action in the second section below does rise if we move -Q ...
Saturday, August 31, 2024

Coupling gravity to electromagnetism helps to position energy and momentum?

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In the previous blog post we got the insight that gravity  is a way to "grab" moving energy in an electromagnetic field. If the el...
Wednesday, August 28, 2024

Kinetic energy of overlapping electric fields: electromagnetic action ignores it?

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UPDATE September 10, 2024: Our blog post today suggests that the extra field pressure of the field E + E' contains "moving" pr...
Monday, August 26, 2024

4/3 and Poincaré stresses

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In our blog post on August 25, 2024 we realized the stress-energy tensor of the field of a static electric charge Q contains both an energy ...
Sunday, August 25, 2024

The 4/3 problem of electromagnetism

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UPDATE August 28, 2024: Henri Poincaré found the correct solution to the 4/3 problem in 1906. ---- UPDATE August 26, 2024: Our solution belo...
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Saturday, August 24, 2024

The electromagnetic action fails for the sum of two static fields?

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UPDATE January 28, 2025: The electric field lines of q below will bend to the left. They will push the charge in the cylinder to the left. T...
Tuesday, August 20, 2024

Electromagnetic waves as stationary points of the action; the 4/3 problem

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UPDATE August 28, 2024: Henri Poincaré's 1906 solution to the 4/3 problem is correct. ---- Let us check if the electromagnetic lagrangia...