Some are real and some are imaginary
They are force field lines at right angles to each other as depicted in the related link.
Magnetic Field!
The "lines" of latitude, longitude, reasoning, electric fields, and magnetic fields are imaginary.
magnetic field is a imaginary area around a manetic material where other magnetic subestences experience some force but flux is the imaginary lines of force that arise from magnet which indicate direction of force around it.
In a uniform magnetic field the imaginary magnetic lines of force are parallel to each other. But in case of non uniform they are not parallel
the lines of force are not real. these lines of force are imaginary lines. so we can not touch it.
Flux means the rate of change of magnetic field lines through a particular region in space. Magnetic field lines are imaginary lines drawn to demonstrate the magnetic field through a region in space. No flux condition means the magnetic field lines in the observed region in space is uniform throughout the experiment.
Magnetic field is the region where a magnetic material such as iron is getting influenced. When current flows through a conductor then magnetic field is created around it. Michael Faraday introduces the magnetic lines of force which are imaginary lines. These start from north pole and end at south pole. North and south poles cannot be isolated from one another. When we bring a small magnetic needle in a magnetic field it will be aligned in the direction of the magnetic field with its north-south poles parallel to the magnetic lines of force.
The imaginary lines on the globe helps because it divides the Northern Hemisphere from Southern Hemisphere. Therefore, imaginary lines are helpful.
Latitude lines are imaginary lines that are parallel to the equator to fix a position on earth (along with longitude lines which are imaginary lines perpendicular to the equator)
If a number is pure imaginary then it has no real component. If it is a real number, then there is no imaginary component. If it has both real and imaginary components, then it is a complex number.