Answer
A magnetic field is produced by objects and causes particles to accelerate, while magnetic flux is directly caused by the magnetic field.
Work Step by Step
The magnetic field is simply a set of forces that act on objects, depending on polarity and distance from the source. The field can also be used to accelerate particles, using the force $F_B=qvBsin\theta$. Magnetic flux is the amount of magnetic field captured in a certain area.
