When does the electric field equal 0 in Gaussian surface-type questions?

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SUMMARY

The electric field is not always zero within a Gaussian surface; it depends on the charge distribution and geometry of the object. For example, the electric field is zero at the center of a uniformly charged sphere, maximum at the surface, and approaches zero at infinity. A Gaussian surface is a mathematical construct used for simplifying calculations, and it does not inherently possess a zero electric field. In many scenarios, selecting a surface with a constant non-zero electric field facilitates easier calculations.

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When asked for the electric field in flux and guassian surface-type questions I'm getting confused as to when the elecrtic field = 0.

I thought that whenever I had a Gaussian surface (sphere, cylinder, box, etc), the electric field inside it would be 0, but I'm seeing that in some cases it's not. I just don't understand...

I'd appreciate any input. thanks
 
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There is a graph on this page

http://www.phys.uri.edu/~gerhard/PHY204/tsl56.pdf

The E field is 0 at the very center, maximum at the surface and 0 infinatly far away.

If a object is not a sphear or not uniformly charged there may be parts which have no E field through them.
 
A Gaussian surface is just a surface you make up because it's convenient for your calculations. There's no reason why a random surface that you chose has to have 0 electric field. In fact, in most cases we choose a surface with constant non-zero electric field, because then it would be easy to solve for that field.
 

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