If a charge q is placed at one of the vertices of a cube, the flux passing through any one face of the cube that does not touch that vertex is .

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(3) q/(24ε₀). Idea: a charge at a corner is shared by the eight cubes that meet there. Imagine them stacked around the charge: together they enclose it completely. Total flux from the charge is q/(ε₀), and by symmetry each of the eight cubes gets 1/8×q/(ε₀)=q/(8ε₀). The three faces that meet at the charge contain it in their own planes; the field runs along them, so they carry no flux. The other three faces share the cube's flux equally: φ_face=1/3×q/(8ε₀)=q/(24ε₀)

If a charge q is placed at one of the vertices of a cube, the flux passing through any one face of the cube that does not touch that vertex is ______.

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Why the other options are wrong