Question

What is Magnetic Flux?

Answer 1

Magnetic Flux is when there are magnetic field lines going through a closed surface. 

Answer 2

Magnetic flux (most often denoted as Φm), is the number of magnetic field lines (also called "magnetic flux density") passing through a closed surface (such as a conducting coil). The SI unit of magnetic flux is the weber (Wb) (in derived units: volt-seconds). The CGS unit is the maxwell.