Electric Field Zero Points: Square Arrangement of Charges | Homework Question

AI Thread Summary
The discussion focuses on determining the points at which the electric field is zero for four charges arranged at the corners of a square. The initial suggestion identifies points A and B as potential zero-field locations due to the symmetry of equal charges. However, concerns are raised about the y-components of the electric field at these points, questioning whether they truly sum to zero. The participant acknowledges that while the x-components may balance, the influence of distant charges could result in a non-zero field in the y-direction. The conversation highlights the complexity of analyzing electric fields in multi-charge systems.
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Homework Statement


Four charges are arranged on the corner of a square. At which points is the electric field equal to zero?

Diagram:
http://img126.imageshack.us/img126/1994/diagram2zb7.png


Homework Equations


None


The Attempt at a Solution


I chose A and B because the charges are equal so therefore the electric field will be zero right inbetween them.
 
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Certainly the x components of the fields are balanced at A & B, but what about the field in the y direction at A & B? Is it 0 at those points?
 
Thanks for your help. I don't know about the y direction.
 
When you are at A what is the field from the far away negative charges? It would be non-zero wouldn't it?

Likewise at point B for the positive charges.
 
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