- #1
Find the electric field of a point P at a distance r
- Thread starter Fatima Hasan
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- Electric Electric field Field Point
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Homework Help Overview
The discussion revolves around finding the electric field at a point P located at a distance r from charged conducting shells. The problem involves understanding the effects of charge distribution and the resulting electric fields at various points.
Discussion Character
- Exploratory, Assumption checking, Conceptual clarification
Approaches and Questions Raised
- Participants question the renaming of points and the relevance of calculating additional points to identify errors. There is discussion about the origin of prefactors in the calculations and the implications of charge distribution on the electric field at specific points.
Discussion Status
Participants are actively engaging with each other's reasoning, identifying potential mistakes in calculations, and clarifying the implications of charge distribution. Some guidance has been offered regarding the calculations, but there is no explicit consensus on the final answers yet.
Contextual Notes
There is mention of specific charges on the conducting shells and the implications of these charges on the electric field at points P1, P2, and P3. The problem statement specifies that the shells carry a charge of -Q each, which is under discussion.
- #2
mfb
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Why did you rename the points?
In (a), you are asked about two points only, but calculating it for the third might help to see what went wrong.
Where did the prefactors come from (2,4,6)? It is difficult to find the error if you don't explain how you got these answers.
In (a), you are asked about two points only, but calculating it for the third might help to see what went wrong.
Where did the prefactors come from (2,4,6)? It is difficult to find the error if you don't explain how you got these answers.
- #3
- #4
mfb
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Why do you add and subtract the charge of the conducting shell?
There is no charge at the point of P2 or P3.
There is no charge at the point of P2 or P3.
- #5
Fatima Hasan
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There is no charge in the conducting shell , so it's zero (+Q-Q=0)mfb said:
- #6
mfb
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The problem statement says the shells carry a charge -Q each.
- #7
- #8
mfb
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That is correct.
- #9
- 42,886
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Almost. You have a mistake in P2 at the final step.Fatima Hasan said:
- #10
Fatima Hasan
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It should be ##\frac{kQ}{(r_2)^2}##haruspex said:
- #11
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Right.Fatima Hasan said:
What about part b? Do you wish to reconsider that answer?
- #12
Fatima Hasan
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At P1 : ##E=0## , because ##Q_{enclosed}=0##haruspex said:
At P2 : ##E = \frac{-KQ}{(r_2)^2}##
At P3 : ##E = \frac{-2KQ}{(r_3)^2}##
- #13
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Yes.Fatima Hasan said:
- #14
mfb
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Good catch, missed the sign.haruspex said:
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