Define Bohr magneton. What is the unit of magnetic moment?
Question
Define Bohr magneton. What is the unit of magnetic moment?
Solution
The Bohr magneton, named after physicist Niels Bohr, is a physical constant and the natural unit for expressing the magnetic moment of an electron caused by its intrinsic properties of spin and orbital angular momentum.
The Bohr magneton is defined as:
μB = eħ / 2me
where:
- e is the elementary charge,
- ħ is the reduced Planck's constant,
- me is the electron rest mass.
The unit of magnetic moment in the International System of Units (SI) is the Ampere square meter (A·m²). However, in atomic physics and condensed matter physics, magnetic moments are often expressed in terms of the Bohr magneton (symbol μB).
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