什麼是磁通量?

Magnetic flux (磁通量) can be conceived as a measure of the "number of magnetic field lines"(磁力線數量) passing through normally on a particular surface area.
It is used to measure the strength of magnetic fields, such as the strength of a permanent or electro magnet.
Mangetic field can be conceptually represented by magneic field lines. The more number of field lines exist in a given space, the stronger is the magnetic field. Magnetic flux is a quantity used to measure the strength of a magnetic field.