Difference Electric Field Strength Point Charges vs. Plates

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Discussion Overview

The discussion centers on the differences in electric field strength between point charges and parallel plates. It explores the variation of electric field strength along a line between two point charges compared to the uniformity of the electric field between parallel plates, considering theoretical implications and assumptions.

Discussion Character

  • Conceptual clarification, Technical explanation

Main Points Raised

  • One participant questions why the electric field strength varies along a line between two point charges, suggesting a flaw in their reasoning.
  • Another participant prompts for clarification on the reasoning behind the initial question.
  • A third participant notes that the uniformity of the electric field between parallel plates holds true primarily when the plates are very large compared to the distance between them, allowing for symmetry considerations in calculations.
  • A later reply indicates that the original poster has resolved their confusion independently.

Areas of Agreement / Disagreement

The discussion does not reach a consensus, as it contains varying perspectives on the conditions under which electric field strength behaves differently for point charges versus parallel plates.

Contextual Notes

The discussion highlights assumptions regarding the size of the plates relative to the distance between them and the implications of symmetry in electric field calculations, which remain unresolved.

Merlion
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Why does the electric field strength on a straight line (E = k.(Q1/d12+Q2/d22). D1,2 = distance with respect to Q1,Q2) between two point charges vary with the location on this line while the field strength between two parallel plates which remains the same anywhere between the plates.

There's obviously a flaw in my reasoning.
 
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Merlion said:
There's obviously a flaw in my reasoning
What is your reasoning ?
 
This is true for plates which are very large compared to the distance between the plates. In such a scenario, the plates can be treated as infinitely large, and you can use symmetry observations to calculate the field.
 
Thanks for the answers.

I found my flaw in my reasoning on my own.
 
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