ELECTRIC CHARGE AND FIELDS

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SUMMARY

The discussion centers on the behavior of electric fields around a wire with uniform linear charge density, specifically addressing why the electric field cannot be assumed to be perpendicular to the curved part of a cylindrical Gaussian surface. Participants highlight that while the wire appears to behave like a point charge at significant distances, the distinction between finite and infinite wire lengths becomes negligible only when in close proximity. The conversation emphasizes the importance of symmetry in analyzing electric fields in electrostatics.

PREREQUISITES
  • Understanding of electric fields and charge distributions
  • Familiarity with Gaussian surfaces in electrostatics
  • Knowledge of symmetry in physics
  • Concept of linear charge density
NEXT STEPS
  • Study the application of Gauss's Law for different charge distributions
  • Explore the concept of electric field lines and their properties
  • Investigate the differences between finite and infinite charge distributions
  • Learn about the implications of symmetry in electric field calculations
USEFUL FOR

Students and professionals in physics, electrical engineering, and anyone interested in understanding electrostatics and electric field behavior around charged objects.

killershek
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In case of wire(having uniform linear charge density), without assuming the wire infinite long, why we can't take electric field perpendicular to the curved part of the cylindrical Gaussian surface?
 
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Hello hek, :welcome:

There's also field lines going in the direction along the cylinder (except in the symmetry plane perpendicular to the axis).

From very far away such a wire should look like a point charge and have the corresponding field. Only close by, the difference between infinitely long and just long is minimal.
 

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