Electromagnetic forces, finding alpha.

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Homework Help Overview

The problem involves determining the value of alpha in a scenario where a third charge is placed at the origin, resulting in a net force of zero. The context is within the subject area of electromagnetic forces, specifically focusing on the interactions between point charges.

Discussion Character

  • Exploratory, Assumption checking, Conceptual clarification

Approaches and Questions Raised

  • The original poster attempts to apply the formula for electric force between charges and seeks guidance on how to proceed with the calculations. Some participants question the setup by asking for clarification on the forces acting on the charge at the origin, particularly regarding the contributions from the other charges.

Discussion Status

The discussion is ongoing, with participants exploring the implications of placing a charge at the origin and the resulting forces. There is a request for an image that is essential for understanding the problem setup, indicating that the discussion is still in the early stages of interpretation and exploration.

Contextual Notes

Access to the referenced image is restricted, which may hinder the ability to fully visualize the problem. The original poster expresses a desire for a detailed walkthrough of the solution process, emphasizing a learning-oriented approach.

sphys4
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Homework Statement



When a third charge is placed at the origin, it is found that the force on it is zero. Find alpha?

Two charges Q and 5Q are located as shown in the figure below.
https://chip.physics.purdue.edu/protected/GiordanoEMimg/chapter17/17prob16.jpg



If possible, please show work so i can learn how to do it. Thanks!


Homework Equations





The Attempt at a Solution


I know that force varies as a function of charge and inversely proportional to square of distance.
So i need to use this equation somehow:
F = k Qa Qb / d^2

 
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That link can only be accessed by Purdue University students. Can you attach the image instead?
 
28ugzsj.jpg
 
So suppose that some charge, q, was placed at the origin. What would be the formula for the force on it due to the charge Q? (And for the sake of argument, suppose for now that all the charges, q, Q, and 5Q are positive).
 

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