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Question

A point charge q is placed at a distance a2 directly above the centre of a square of side a. The electric flux through the square is
  1. qϵ0
  2. qπϵ0
  3. q4ϵ0
  4. q6ϵ0


Solution

The correct option is D q6ϵ0
An imaginary cube can be made by considering charge q at the centre and given square is one of it's face.

So flux from given square (i.e. one face) ϕ=q6ϵ0

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