# Flux linked with lower face of a cube

premraj59

## Homework Statement

A point charge q is placed inside a cube of side 2a. What will be the flux associated with the lower surface ABCD?

## Homework Equations

I think I can apply Gauss Law here, but can't think of something connecting it with the lower surface.
∫B.dl = 1/ε° X Charge Enclosed

## The Attempt at a Solution

I tried to solve it by taking charge as q/6 (as cube has 6 faces) but the solution doesn't seem to work out.

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You have not given enough information. Please reproduce the problem statement exactly as given.

Also, do not just say ”it does not seem to work”. In order to help you we must know exactly what you have done and what you obtained, not a vague description.

Mentor
A point charge q is placed inside a cube of side 2a.
Where? At the center?

∫B.dl = 1/ε° X Charge Enclosed
That's not Gauss' law. Look it up.

I tried to solve it by taking charge as q/6 (as cube has 6 faces) but the solution doesn't seem to work out.
That should work fine, once you apply the right law. (Assuming the charge is at the center of the cube.)