Solving potential of electron inside the nucleus

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Homework Help Overview

The discussion revolves around deriving the potential energy of an electron within a nucleus, modeled as a uniformly charged sphere. The specific equation in question relates to the potential energy as a function of the distance from the center of the nucleus.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to derive the potential energy equation but encounters difficulties with integration limits. Some participants suggest verifying the electric field's behavior at the boundary of the nucleus and its relationship to point charges. Others clarify that the electric field inside a uniformly charged sphere is proportional to the radius, prompting questions about the mathematical derivation of this relationship.

Discussion Status

The discussion is active, with participants providing guidance on checking the consistency of the derived formula with known physical principles, such as the shell theorem. There is an ongoing exploration of the mathematical derivation needed to reach the desired formula.

Contextual Notes

Participants are navigating the complexities of electric field behavior within a charged sphere and the implications for potential energy calculations. There is an emphasis on ensuring that the derived equations align with established physical laws.

haseeb
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Homework Statement


I want to derive the following equation. It is the potential energy of an electron inside a nucleus assumed to be a uniformly charged sphere of R.

Homework Equations



V'(r) =( -Ze2/4∏ε0R)(3/2 - (1/2)(r/R)^2)

The Attempt at a Solution


I get E = Ze2r/(4∏ε0R3)

But I am having problem in integration limits and hence going towards final required result!
 
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The electric field should be linear with the distance - right. You can check if the electric field at the border of the nucleus agrees with the electric field of a point-charge. If yes, your result is right.
 
mfb said:
Something went wrong with the formatting.

The electric field should be linear with the distance - right. You can check if the electric field at the border of the nucleus agrees with the electric field of a point-charge. If yes, your result is right.
First, Electrical field is not linearly dependent on distance! And I am not trying to find the field at the nucleus border but inside it. Can you help please to reach the desired formula?
 
haseeb said:
Electrical field is not linearly dependent on distance!
Inside a homogeneously charged sphere, it is proportional to the radius, its magnitude is proportional to the distance to the center.

If your formula reproduces this relationship and agrees at the boundary, then it is right. Hence the suggestion to check if it fits at the boundary.
 
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mfb said:
Inside a homogeneously charged sphere, it is proportional to the radius, its magnitude is proportional to the distance to the center.

If your formula reproduces this relationship and agrees at the boundary, then it is right. Hence the suggestion to check if it fits at the boundary.
Yup! You are right... But How to drive it mathematically?
 
The shell theorem should help.
 

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