For a charged particle placed at the center of a spherical Gaussian surface, the field line flux

Question:

For a charged particle placed at the center of a spherical Gaussian surface, the field line flux through the surface is $+\Phi$. Suppose that the spherical Gaussian surface is replaced by a cubical Gaussian surface composed of six square plates. Square plates are positioned above and below the charged particle to form two sides of the cubical Gaussian surface that is centered on the charged particle, as shown in Figure P24.35. What is the field line flux through each plate?

Data from Figure P24.35

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