Question

what is magnetic flux?

Answer 1

It is the number of magnetic field lines passing through a surface (such as a loop of wire). The magnetic flux through a closed surface (such as a ball) is always zero. ... The SI unit of magnetic flux is the Weber (Wb) (in derived units: volt-seconds).

Answer 2

In physics specifically electromagnetism, the magnetic flux through a surface is the surface integral of the normal component of the magnetic field B passing through that surface