Electrical flux passing through the cube

[MatinSAR]

Homework Statement

Consider a rod with an electric charge density λ that passes through the center of the cube. Prove that the electric flux passing through this cube is equal to = q / ε0

Relevant Equations

Gauss's law

Picture for better understanding.
My answer :

I want to know how to solve this problem without using cylindrical. I mean how can we solve this using cube and its sides.
Thanks.

 

[BvU]

Relevant Equations:: Gauss's law

I want to know how to solve this problem without using cylindrical. I mean how can we solve this using cube and its sides.

What about your relevant equation ?

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[MatinSAR]

What about your relevant equation ?

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Thank you ... but what do you mean by relevant equation?

 

[BvU]

Does your relevant equation worry about the shape of the surface ?

[edit]On the other hand,

Prove that the electric flux passing through this cube is equal to = q / ε0

could be interpreted as an invitation to show that for this case the gauss identity holds. In that case you could actually integrate the flux: you know the electric field (right?) and can benefit from symmetry.

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[MatinSAR]

Does your relevant equation worry about the shape of the surface ?

I guess no it doesn't ... Thank you for your help ...