Cube Field 2 How Can A Electric Flux Of A Cube Be Like This? (With Reference To A Dipole Of A Field).?

How can a electric flux of a cube be like this? (With reference to a dipole of a field).? - cube field 2

If View Website http://www.ncert.nic.in/book_publishing/NEW 20Book% 20class %%%%%% 20PHYSICS 202007/class12/PDF 20XII 201.pdf or just electrical charges 20I/Chapter NCERT type "Yahoo search engine first and open the PDF file that can be found on page 35 you can find indicates that we have a problem, an issue that we need to have to find the load flow and a cube to be found. The details of the question and answer that you read on the website. My questions are:
1. What is Delta S exactly this problem and what it means?
2. What is E and how the angle between S and E & Delta + or - 180 degrees?
3. It's angle E (index) The electric field of the N line (index) L? How can x = a face on the left side? Is this because a part of x is the common part of the cube and X, and it is the left side?
4. Why is x = 2a are on the right side?
5. Why have flows into the left and right of cos theta increases, and why is 180 and 0 degrees, respectively?

Plz some or all questions quickly. If you notice any inaccuracies in the matterthen plz tell me if I rephrase my question. Thank you.