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Flux of a cube 
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#1
Feb1007, 04:51 PM

P: 139

1. The problem statement, all variables and given/known data
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? 2. Relevant equations 4*pi*Q 3. 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. 


#2
Feb1007, 06:32 PM

Mentor
P: 41,306

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
Feb1007, 06:50 PM

P: 139




#5
Feb1007, 08:35 PM

P: 139




#6
Feb1007, 08:37 PM

Mentor
P: 41,306

Start by figuring out which side has the most flux passing through it.



#7
Apr1707, 03:28 PM

P: 1

hummm is it Q/Eo/6?



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