The rate of change of magnetic field strength or the rate of change of magnetic field density within a unit distance (for example, 1 cm). The degree of inhomogeneity of the magnetic field can be measured by the magnetic field gradient. As shown in the figure below, the distribution of magnetic field lines in a uniform magnetic field is uniform, but the distribution of magnetic field lines in an uneven magnetic field is not uniform. The larger the magnetic gradient, the easier it is to adsorb.
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