Electrostatic Potencial Problem

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Homework Help Overview

The problem involves determining the locations where the net electrostatic potential is zero due to two point charges: a positive charge of +9 μC at the origin and a negative charge of -2 μC at a distance L along the x-axis.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants discuss the nature of the electric fields produced by the two charges and how their potentials interact. Questions arise regarding the implications of the charges being of opposite polarity and the conditions under which the potentials can equal zero.

Discussion Status

Some participants have offered insights into the behavior of electric fields and potentials, suggesting that the potentials from both charges can be analyzed at various points along the x-axis. There is an ongoing exploration of the distances from each charge and how these relate to the net potential.

Contextual Notes

Participants are considering the implications of the charges being of opposite signs and the specific locations where the net potential might equal zero. There is also a mention of potential confusion regarding the nature of the charges involved.

loba333
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Homework Statement


Here is the problem :
http://i1200.photobucket.com/albums/bb327/loba333/untitled.jpg
ill write it out again aswell
A particle with charge +9 μC is placed at the origin, and another particle of charge –2 μC is at x = L. At what two points is the net electrostatic potential equal to zero?

Homework Equations


V=KQ/r

The Attempt at a Solution


I could understand if they were the same sign charges then there would be an area of 0 field strength.
Could someone please explain to me what's going on and how to solve it.

Cheers
 
Last edited:
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The charges have opposite polarity, what more could you want?:smile:
 
gneill said:
The charges have opposite polarity, what more could you want?:smile:

sorry i ment same sign charges
 
Both charges have their own electric fields, and their potentials add up. One is negative, the other is positive, and their magnitudes are the same at certain points. Choose the point at x. What is the distance of the selected point from the negative charge when x<L and what is it when x>L? What are the potentials?

ehild
 

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