Net electric flux through torus

AI Thread Summary
To find the net electric flux through a torus, apply Gauss's law, which states that the net flux is equal to the enclosed charge divided by the permittivity of free space. The problem indicates an enclosed charge of -1 nC, making the calculation straightforward once the area is determined. However, the lack of radius information complicates finding the area for the torus. The discussion emphasizes that the torus is a closed surface with both inner and outer surfaces. Overall, understanding Gauss's law is crucial for solving this problem effectively.
dtesselstrom
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Homework Statement


What is the net electric flux through the torus (i.e., doughnut shape) of the figure



Homework Equations



net flux= E*A I believe is needed

The Attempt at a Solution


I don't know how to do this problem at all. I feel like I don't have enough information to calculate the answer. Any advice as how to start this problem because I don't have the radius of the objects so how can I figure out the area.
 

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Use Gauss's law. The enclosed charge is - 1 nC if you choose the torus as the closed surface. It is a closed surface since it has an outer and inner surface and one cannot pass from the one to the other.
 
andrevdh said:
Use Gauss's law. The enclosed charge is - 1 nC if you choose the torus as the closed surface. It is a closed surface since it has an outer and inner surface and one cannot pass from the one to the other.

I had the same problem! you are right! thanks~
 

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