As we know that, total flux due to a charge enclosed in a region is given as ϕ=Qε0 (Gauss's law)
Here, the charge is on a corner of each of the 8 cubes.
Hence, an equal amount of flux will spread outwards through each of the cubes due to symmetry.
Hence, the magnetic flux through each cube is given as ϕ=Q8ε0.Since three faces don't have any effect, the flux will be divided into three parts again.
Therefore, total flux will become, ϕ=Q24ε0
The correct option A.
![1434294_1086972_ans_a50ce65cddd74d68bd3009bbc05e75e0.PNG](https://search-static.byjusweb.com/question-images/toppr_invalid/questions/1434294_1086972_ans_a50ce65cddd74d68bd3009bbc05e75e0.PNG)