Electric flux definition confusion

[julius71989]

Help. I am confused. I have read two different infos in different textbooks. I have read the topic about electric flux in different books. The first book says that electric flux is simply the Q (charge)in an enclosed surface, on the other hand, the other book says that electric flux is the Q/e(epsilon) in an enclosed surface. Which is correct? I have sought other different books but still it showed me these different ideas.

 

[Defennder]

The first case, for which the flux through the closed surface is Q, is the flux of D, the electric displacement, whereas the second one is for E the electric field.