| http://www.w3.org/ns/prov#value | - thod for controlling a magnetic field level may be comprised of the following steps of connecting 2n reactors, where n is an integer, such that one half of them have dipole moments in the same direction and the other half have dipole moments in the opposite direction to form a multipole of order 2n, the far field of which varies with distance inversely as distance to the power (3+n); wherein the r
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