Gaussian Surfaces and infinite lines of charge

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SUMMARY

The discussion centers on the comparison between electric fields generated by infinite planes and infinite lines of charge. For an infinite plane of charge, the electric field remains constant regardless of distance, while for an infinite line of charge, the electric field is described by the equation E = (charge density)/(2∏ε * r), indicating that it varies inversely with the radius 'r' of the Gaussian surface. This discrepancy highlights the fundamental differences in electric field behavior between these two configurations, necessitating a deeper understanding of electrostatics.

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  • Understanding of Gauss's Law
  • Familiarity with electric field concepts
  • Knowledge of charge density and its implications
  • Basic principles of electrostatics
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Students of physics, particularly those studying electromagnetism, educators teaching electrostatics, and anyone seeking to deepen their understanding of electric fields generated by various charge distributions.

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So I've been wondering..
from my previous post: https://www.physicsforums.com/showthread.php?p=4500082#post4500082

if we have a plane of infinite charge, then electric field does not depend on distance

however, for a infinite line of charge:
If we use a cylinder with radius 'r' as our gaussian surface then
the electric field has the equation

E = (charge density)/ (2∏ε * r)

which now depends on the radius of the cylinder.

This suggests that the electric field actually will have different values for different radius values
which (i feel) don't line up with the conclusion I reached in my first thread 'if we have a plane of infinite charge, then electric field does not depend on distance'

Any help?
 
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