E-field from uniformly distributed charges on sphere?

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Discussion Overview

The discussion revolves around the electric field generated by a uniformly charged sphere, specifically examining the effects of charge distribution on the electric field at a point outside the sphere. Participants explore the relationship between Coulomb's law and Gauss's Law in this context.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant suggests that the electric field at a point away from the sphere is influenced by all individual charges distributed across the sphere.
  • It is proposed that the net electric field would only have a component in the X direction due to symmetry, with equal opposing forces in the Y and Z directions.
  • A question is raised about whether summing the electric fields in the X direction using Coulomb's law would yield the same result as that calculated using Gauss's Law.
  • Another participant confirms that the electric field is indeed affected by all charges and agrees with the directional analysis, provided that the center of the sphere and the point of interest are aligned along the X axis.
  • It is mentioned that this relationship is a consequence of Newton's shell theorem.

Areas of Agreement / Disagreement

Participants generally agree on the influence of the charge distribution on the electric field and the directional analysis, but there are questions regarding the specifics of the sphere's structure (hollow vs. solid) and the nature of the point of interest.

Contextual Notes

There is a lack of clarity regarding whether the sphere is hollow or solid, and whether the point in question is a charge or merely a location for evaluating the electric field. These factors may influence the discussion but remain unresolved.

yosimba2000
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So if I have a sphere of uniform charge distribution, the electric field at one point away from the circle would be affected by ALL individual charges distributed across the circle, right?

From the picture I drew, there would only be a net effect of E-field in the X direction because there would be equal opposing forces in the Y-direction as well as Z-direction, right?

If I added up all the electric fields in the X-direction at that point using Coulomb's law for each point charge on the sphere, would it also match the E-field calculated from Gauss's Law?

I've drawn a top-down picture here: https://imgur.com/a/kAQjS
 
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yosimba2000 said:
I've drawn a top-down picture here: https://imgur.com/a/kAQjS

In future always try and post images to the thread ... It's much easier for people to discuss the query :smile: ...

Vh1nr8S.gif


there we go :wink:
 
is the sphere hollow or solid ?
Is point P a charge or are you just wanting to know what the E-field is at that point ?

for a Gaussian hollow sphere have you come across this in your studies ? ...

upload_2017-10-9_15-30-45.png
Dave
 
yosimba2000 said:
So if I have a sphere of uniform charge distribution, the electric field at one point away from the circle would be affected by ALL individual charges distributed across the circle, right?
Yes
yosimba2000 said:
From the picture I drew, there would only be a net effect of E-field in the X direction because there would be equal opposing forces in the Y-direction as well as Z-direction, right?
Yes, so long as the center of the sphere and point p are both on the x axis.
yosimba2000 said:
If I added up all the electric fields in the X-direction at that point using Coulomb's law for each point charge on the sphere, would it also match the E-field calculated from Gauss's Law?
yes, this is a result of Newton's shell theorem https://en.wikipedia.org/wiki/Shell_theorem.
 

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