Flux of a cube

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Electric Flux of a cube

Homework Statement


A point charge of magnitude 9.10 nC is at the center of a cube with sides of length 0.685 m.

What is the electric flux through each of the six faces of the cube?

What would be the flux Phi_1 through a face of the cube if its sides were of length 0.250 m?

Homework Equations


4*pi*Q


The Attempt at a Solution



I tried 4*pi*9.10 which equals 411 and it says I'm off by an additive constant

I know to do part2, the flux must be found for part1 but i'm not sure if i'm applying gauss's law correctly, I know that you can use symmetry to solve these cube problems but I haven't had a decent example of this type of problem and we already have hw on it.
 
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Answers and Replies

  • #2
Doc Al
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Hint: What's the total flux through any closed surface that surrounds a charge Q? Once you find the total flux, then use symmetry to find the flux through each side of the cube.
 
  • #3
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Hint: What's the total flux through any closed surface that surrounds a charge Q? Once you find the total flux, then use symmetry to find the flux through each side of the cube.
Is the flux on any surface that surrounds a charge Q => Qenclosed / Eo
 
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  • #4
Doc Al
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Is the flux on any surface that surrounds a charge Q => Qenclosed / Eo
Yes it is.
 
  • #5
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Yes it is.
Though with this, knowledge, I'm still not sure how to figure out the flux on each side of the cube.
 
  • #6
Doc Al
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Start by figuring out which side has the most flux passing through it. :wink:
 
  • #7
hummm is it Q/Eo/6?
 

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