How to deduce Gauss' law from Gauss Divergence Law

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SUMMARY

The discussion centers on the relationship between Gauss' Law and the Gauss Divergence Law, specifically whether Gauss' Law can be derived from the latter. It is established that while the volume integral of the divergence of the electric field (∇·E) is proportional to the total charge (Q) enclosed, the integrands must be equal, leading to the conclusion that div E equals charge density divided by ε₀. Additionally, the singularity in the electric field at r=0 must be considered in this context.

PREREQUISITES
  • Understanding of Gauss' Law and Gauss Divergence Law
  • Familiarity with spherical coordinates in electromagnetism
  • Knowledge of electric field strength equations
  • Basic concepts of charge density and permittivity (ε₀)
NEXT STEPS
  • Study the derivation of Gauss' Law from Maxwell's equations
  • Explore the implications of singularities in electric fields
  • Learn about the mathematical applications of Gauss' theorem
  • Investigate the relationship between charge density and electric fields in different coordinate systems
USEFUL FOR

Students of electromagnetism, physicists, and educators looking to deepen their understanding of the foundational principles governing electric fields and charge distributions.

nenyan
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Homework Statement


Gauss Divergence Law:
df53cbd418aaded3f2ad2d2fe1d60f2d.png

Gauss' law
914f57946de3c30d15e1a9778b276842.png


Can we obtain the Gauss' Law from Gauss Divergence Law?

Homework Equations



In Spherical coordinates,

electric field strength

(Q/4\piεr^2,0,0)
Then ∇\cdotE=0+0+0=0

The Attempt at a Solution



We can not obtain the Gauss' Law from the general mathematical law?
 
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So the volume integral of div E [application of Gauss' theorem to Gauss' law) is proportional to Q, the total charge included.

But Q is the volume integral of the charge density ... so we have a volume integral on both sides.

Then the integrands must be equal, which gives div E = densit/eps_0.
 
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nenyan said:

Homework Statement


Gauss Divergence Law:
df53cbd418aaded3f2ad2d2fe1d60f2d.png

Gauss' law
914f57946de3c30d15e1a9778b276842.png


Can we obtain the Gauss' Law from Gauss Divergence Law?

Homework Equations



In Spherical coordinates,

electric field strength

(Q/4\piεr^2,0,0)
Then ∇\cdotE=0+0+0=0

The Attempt at a Solution



We can not obtain the Gauss' Law from the general mathematical law?
There's a singularity in ##\vec{E}## at r=0 you need to account for.
 

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