Find all the points along the line passing through both charges

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Homework Help Overview

The problem involves two arrangements of point charges, specifically determining the points along the line connecting the charges where the electric potential and electric field are zero. The charges in question include both positive and negative configurations, and the distances between them are denoted as 'd'.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants discuss the conditions under which the electric potential and electric field are zero, with some suggesting that infinity may be a solution. There are attempts to identify specific points for both arrangements of charges, and questions arise regarding the relevant equations needed for the calculations.

Discussion Status

The discussion is ongoing, with some participants providing partial insights into the first part of the problem. There is a recognition that additional equations are necessary for further analysis, particularly for the second part of the problem involving the different charge configurations.

Contextual Notes

Participants note the need for relevant equations and the implications of the charge configurations on the electric potential and field. There is an acknowledgment of the complexity introduced by the presence of both positive and negative charges.

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Homework Statement



For each of the following arrangements of two point charges, find all the points along the line passing through both charges for which the electric potential V is zero (take V = 0 infinitely far from the charges) and for which the electric field E is zero. (Use the following as necessary: Q, d. Enter 0 or ∞ if necessary.)

(a) charges +Q and +2Q separated by a distance d
V = 0: x =
E = 0: x =

(b) charges −Q and +2Q separated by a distance d
V = 0: x =
y =
E = 0: y =

Homework Equations





The Attempt at a Solution



(a) V=0: X=∞
 
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You got the first part of a right (well they said points, so -∞ is also an solution), take a stab at the second part of a.

For b you will need the relevant equations.
 
Spinnor said:
You got the first part of a right (well they said points, so -∞ is also an solution), take a stab at the second part of a.

For b you will need the relevant equations.

For the second part I tried Q+1/4d but it was wrong. I thought that at that point the positive charges would even out at a net electric field of 0.
 
What relevant equations should I refer to here?
 

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