Electric flux (positive, negative, or zero?)

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SUMMARY

The discussion centers on determining the nature of electric flux through a loop due to a positive point charge. The consensus is that the electric flux is positive, as the area vector aligns with the direction of the electric field lines emanating from the charge. The participant expresses confusion regarding the concept of electric flux being positive or negative, noting that most materials focus on enclosed surfaces rather than specific loops. This highlights a gap in understanding how electric flux can be quantified in different scenarios.

PREREQUISITES
  • Understanding of electric field concepts and vector direction
  • Familiarity with Gauss's Law and its applications
  • Knowledge of point charges and their electric field representation
  • Basic grasp of electric flux and its mathematical formulation
NEXT STEPS
  • Study Gauss's Law and its implications for electric flux
  • Explore the mathematical definition of electric flux through surfaces
  • Investigate the relationship between electric field lines and area vectors
  • Review examples of electric flux in various geometrical configurations
USEFUL FOR

Students of physics, educators teaching electromagnetism, and anyone seeking to deepen their understanding of electric flux and its applications in electrostatics.

rwrem
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Homework Statement



Imagine a positive point charge on the left side of the picture and an area defined by a loop on the right. I was asked to draw and label the area vector and sketch the electric field lines due to the point charge, which I did. The next questions asks:

Is the electric flux through the loop due to the charge positive, negative, or zero?

===

My inclination is to say positive because the direction the area vector points is the same as the direction of the electric field lines.

But, the materials I've seen so far talks about the the electric flux flowing into or out of some enclosed box or sphere and never really mentions that an electric flux can be positive or negative. I can understand where you could get a zero total flux answer, where the flux flowing into and out of a box is the same, but am not sure how that relates to the situation above.

Again, due to missing some classes due to swine flu, I may have missed some fundamental explanations...
 
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So, I guess it's positive, then? Seems logical to me, but I'm surprised no one has commented yet...
 

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