# Point charge potential and electric field [closed]

What is the difference between the 2D and 3D electric field and the potential. Why is it that the potential increases when going from the 2D to the 3D representation but the electric field decreases? I understand the equations surrounding this explanation, but why does this happen? Note that here we refer to the 2D case as an infinitely long line of charge extending into and out of the screen. For the 3D case, this is simply a spherical point charge in free space.

• What do you mean by a point charge in 2D space? A line of charge in 3D? Commented Apr 10, 2020 at 12:53
• @Vadim Sorry, In 2D space I refer to it as being an infinite line of charge extending into and out of the screen
– JayP
Commented Apr 10, 2020 at 12:59
• Point charges in 2D and 3D are different animals. When you say "representation" this suggests that they are the same. Commented Apr 10, 2020 at 13:02
• @my2cts Hopefully that sounds better
– JayP
Commented Apr 10, 2020 at 13:05
• @Artem Pulemotov Re. "In 2D space I refer to it as being an infinite line of charge extending into and out of the screen" That can not happen since by definition of 2D there is no dimension "extending into and out of the screen". Commented Apr 10, 2020 at 18:19