Magnetic force of two parallel wires is inverse proportional to distance?

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Discussion Overview

The discussion centers on the relationship between the magnetic force of two parallel wires and their separation distance. Participants explore the mathematical representation of this relationship and its implications across different dimensions, considering both theoretical and conceptual aspects.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant references a formula indicating that the magnetic force is proportional to the product of the currents and inversely proportional to the distance, questioning if it should be inversely proportional to the square of the distance.
  • Another participant asserts that the relationship is correct and explains that the inverse laws vary with dimensions, suggesting that the scenario of two infinite parallel wires resembles a 2-D problem.
  • A participant acknowledges this explanation and summarizes the dimensional relationships as: 1D corresponds to r, 2D to 1/r, and 3D to 1/r².
  • Further clarification is provided regarding the behavior of the force at different separations, noting that at 1 km apart, the force behaves nearly as 1/r, while at larger distances, it approaches a 1/r² relationship.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the exact nature of the relationship across different distances, as there are varying interpretations of how the force behaves in different dimensional contexts.

Contextual Notes

Participants mention that the behavior of the magnetic force changes with distance, suggesting that assumptions about dimensionality and distance may influence the interpretation of the force's dependence.

ctech4285
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Its right.

The inverse X laws are different in different dimensions. Two infinite parallel wires is a lot like a 2-D problem where its usually the "inverse-r" law.
 
ah that makes sense, thanks! 1d -> r; 2d -> 1/r; 3d -> 1/r`2
 
To complete your 3D understanding of this, imagine two wires 1km long separated by 1cm.

For these wires, as they are separated the force will go very nearly as 1/r. When they are about 1km apart it will not be 1/r or 1/r^2 but something in between. When they are a million km apart the force will go very nearly as 1/r^2.

(1D goes as a constant or 1/r^0)
 

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