Why Is Q Positive in Charge Balancing Equations?

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Homework Help Overview

The discussion revolves around charge balancing equations, specifically questioning why a charge is considered positive in a given context. The original poster presents an equation involving charges and expresses confusion regarding the correct value of Q.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants explore the implications of charge values in equations, questioning the original poster's interpretation of the equation 2Q + x = -Q. There is a focus on the behavior of charges when connected by a conducting wire.

Discussion Status

Some participants affirm the correctness of +Q, while others seek to clarify the reasoning behind the original poster's calculations. Multiple interpretations of the charge balancing are being explored, and there is an ongoing examination of assumptions related to the charges involved.

Contextual Notes

The discussion includes references to the behavior of charges in a Gaussian surface and the implications of connecting charged spheres, indicating a need for clarity on charge distribution and definitions.

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Homework Statement





[PLAIN]http://img256.imageshack.us/img256/9025/93408370.jpg

The Attempt at a Solution



Shouldn't it be 2Q + x = -Q

x = -3Q?

My book say it is +Q
 
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+Q is correct.
What would happen to the single electrons carrying the charge if you joined the two spheres by a conducting wire?
 
betel said:
+Q is correct.
What would happen to the single electrons carrying the charge if you joined the two spheres by a conducting wire?

Then why am I wrong? 2Q + x = -Q?
 
Don't you mean 2Q + (-Q) = x = +Q ?

After all, the total enclosed charge in a Gaussian surface surrounding both spheres would contain a net charge of +Q.
 

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