Finding Zero Potential Points on the x-axis with Two Charges

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Homework Help Overview

The problem involves two charges placed along the x-axis, specifically a 3 µC charge at 14 cm and a -4 µC charge at 15 cm. The objective is to identify the points along the x-axis where the electric potential is zero.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the nature of electric potential as a scalar quantity and consider the implications of setting the potential to zero. There is a focus on the relationship between distance and potential, with some questioning the interpretation of the equation v=q/r when v is zero.

Discussion Status

The discussion is ongoing, with participants exploring different interpretations of the potential equation and the distances involved. Some guidance has been offered regarding the need to express distances in relation to each charge and to consider various cases along the x-axis.

Contextual Notes

Participants are navigating the implications of the charges' positions and the requirement to find points of zero potential, with some uncertainty about the mathematical relationships involved.

andy2004
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Two charges are placed along the x-axis; 3uC at 14 cm, and -4uC at 15 cm. Find those points along the x-axis where the potential is zero. (u = micro or 10^-6)
 
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Well, what have you done? you know potential is a scalar quantity, simply solve for r.
 
when i solve it, the v=q/r which means r = q/v, if v=0 then r=q/0. does that means r= infinite or r=zero. I am thinking infinite.
 
Andy, the r's in the equation is the distance from the particular charge up to the point where you want to calculate the potential. Write r2 in terms of r1 and the separation beween them before you solve for V1 = -V2. Try to solve for all three cases in between the two charges and on both sides outside of the two.
 

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