(a) Electric flux is defined as the number of electric field lines passing through an area normal to the surface.
Alternatively.
The surface integral of the electric field is defined as the electric flux through a closed surface
![](https://www.sarthaks.com/?qa=blob&qa_blobid=8543092493082029829)
Hence, electric field is independent of the distance from the sheet.
(c) For positively charged sheet, the field is directed away from the sheet.
For negatively charged sheet, the field is directed towards the plane sheet.