Magnetic field .
The region around a magnet where a force can be felt is known as the magnetic field. It extends outward from the magnet in all directions and is strongest close to the magnet's poles. Objects within the magnetic field will experience a force if they are magnetic or if they have moving electric charges.
The flat surface that goes on and on in all directions has no boundaries. This flat surface is called infinite surface. Accordingly, the answer is that the flat surface that goes on and on in all directions is called an infinite surface.
You're talking about the 'magnetic field', but you're not giving it enough credit.It doesn't only exist in the space around the magnet, but it technically extendsout to infinity, whether or not you can feel it past a couple of feet.
The volume surrounding a magnet will be filled with the lines of magnetic force. Since these are similarly polarized, they repel each other - eventually creating a sphere at a sufficiently large distance. This sphere is the magnetic field of that magnet.
A plane
It is a plane.
Plane
Plane
plane
no, it acts in all directions
No. It goes in all directions.
a plane