Electric potential from electric field at 2 points

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Discussion Overview

The discussion revolves around calculating the difference in electric potential between two points outside a sphere with a non-uniform charge distribution. Participants explore the implications of the charge distribution on potential calculations and the mathematical steps involved in the solution process.

Discussion Character

  • Homework-related
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant outlines a series of steps to find the potential difference, including assumptions about the total charge and treating the sphere as a point charge.
  • Another participant raises concerns about the challenges of determining the effective charge distribution due to its non-uniform nature, likening it to finding the center of mass of a non-uniform density.
  • A third participant clarifies that the non-uniform charge distribution is defined as 1/(r^2) microcoulombs, suggesting that the electric field may still be uniform at a given distance from the sphere.
  • Another participant emphasizes the need to state the problem verbatim and suggests that if the non-uniformity is restricted to radial distance, the problem may simplify to an integration to find an effective charge at the origin.

Areas of Agreement / Disagreement

Participants express differing views on the implications of the non-uniform charge distribution and the steps needed to calculate the potential difference. There is no consensus on the correct approach or the interpretation of the problem.

Contextual Notes

Participants note the complexity introduced by the non-uniform charge distribution and the potential need for integration to accurately determine the effective charge. The discussion highlights the importance of clearly stating the problem and assumptions involved.

Who May Find This Useful

This discussion may be useful for students and educators dealing with electric potential calculations, particularly in contexts involving non-uniform charge distributions and the mathematical intricacies of such problems.

pirates02
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Homework Statement


i have a sphere with center at origin that is partially empty inside with a non-uniform charge. i have 2 arbitrary points outside the sphere. find the difference in potential between the 2 points.

Homework Equations


The Attempt at a Solution


1) find total charge of sphere
2) assume it is a point charge at origin
3) the electric potential is equal at r distance from origin, so i took abs of 2 points and subed it in for distance
3) use the voltage equation (Efield*r), charge being from 1) and distance being from 3)
4) subtract the two to find difference

is something wrong with my steps?
im not writing my step by step throughly puncuated explanation again. auto-log out made me lose it. also stressful week.
 
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Seems to me the difficulty is in determining the origin if the charge distribution is completely non-uniform. Like finding the c.m. of a non-uniform-density mass.

Interesting and suspicious that they ask for the difference in potential between two observational points rather than just one. As if there is some coomon-mode term that cancels. Anyone?
 
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er the 'ununiform' was 1/(r^2) uC so technically in a sense the electric field is still equal at X distance from the sphere.
 
You need to state the problem as it was given to you, verbatim et litteratim.

Speaking in spherical coordinates, if the non-uniformity is restricted to r then you're right, and the problem reduces to a simple integration to find the effective q situated at the origin.
 
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