What Is the Correct Charge to Use for Calculating Electric Flux in a Torus?

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Homework Help Overview

The discussion revolves around calculating the net electric flux through a torus, given specific charge values. The subject area includes concepts of electric flux and charge distribution in electrostatics.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants discuss the appropriate charge to use for calculating electric flux, questioning whether to consider the net charge or individual charges. There is also a focus on verifying the correct value of the permittivity constant.

Discussion Status

Some participants have provided guidance on checking the value of the permittivity constant, while others are exploring different interpretations of which charge should be used in the calculation. There is an ongoing inquiry into the specifics of the charge distribution within the torus.

Contextual Notes

Participants are uncertain about the definitions of the charges involved, particularly whether to use the net charge or specific charges, and whether the +60nC charge is contained within the torus.

jincy34
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Homework Statement



What is the net electric flux through the the torus if a=-6 nC and b=60 nC ?


Homework Equations



Electric flux=Qin/E

The Attempt at a Solution



I solved with Qin being 6*10^-9 C as it is the charge inside and E0=8.85*10^-12. I got 678 for electric flux. But it is wrong.
 

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[tex]\epsilon_0 = 8.85*10^{-12}[/tex] not [tex]8.85*10^{-9}[/tex].

This may be your problem. If it is not, show your work and we may be able to give you more in depth help.
 
I put the right value for E0. But, I am not sure if the charge I am using is right or not. Is the charge inside 60nC, 6nC or net charge?
 
Last edited:
jincy34 said:
I put the right value for E0. But, I am not sure if the charge I am using is right or not. Is the charge inside 60nC, 6nC or net charge?

Is the +60nC charge contained inside the surface of the solenoid?
 

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