Diamagnetism

Diamagnetism

In many materials there are equal numbers of electrons spinning and orbiting in opposite directions so that, in the absence of some external magnetic field, their effects cancel out. If, however, a magnetic field is applied the electron orbits are very slightly disturbed by electromagnetic induction (page 484). This very slightly weakens the field inside the material giving a minute magnetic effect called diamagnetism. This name is derived from the fact that such substances set with their length perpendicular to a strong magnetic field instead of in line with it as do para- and ferromagnetic substances.

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