Bohr magneton
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The Bohr magneton (symbol ), sometimes also called Landé factor, is named after the physicist Niels Bohr. It is a physical constant of magnetic moment, defined by:

where:

is the elementary charge,

is the Dirac's constant,

is the electron rest mass

In the SI system of units its value is approximately:

= 9.274 008 99(37) × 10^-24 J·T^-1

The original article can be found at: http://en.wikipedia.org/wiki/Bohr_magneton.
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