The strength of the magnetic field magnetizing machine is a characterization of the amount of the coil, the magnetic field intensity reflects the source. Magnetic induction represents the effect of a magnetic field source in a given environment. To make an inappropriate analogy, you use a fixed force to move an object, but the object of the actual effect is not the same, such as you are with the help of tools, you may also make a different position or direction of force. You've used a certain amount of strength for you. And the object has a real feeling, you force the role of magnetic field strength, and the actual feelings of the object, such as magnetic induction.