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Question

A charge q is placed at the centre of a cube of side l. What is the electric flux passing through each face to the cube?

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Solution

Step 1: Applying Gauss Law for cube
Assuming the cube as gaussian surface, total flux passing through the cube of side l can be given as,
ϕ=qϵo

Step 2: Flux through each face of the cube
As the charge is placed symmetrically to each face of the cube, thus electric flux passing through each face is equal.

Electric flux passing through each face, ϕ=ϕ6=q6ϵo

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