The value of Bohr magneton is

${\mu }_{\mathrm{B}}=9.274\times {10}^{-24}{\mathrm{JT}}^{-1}$

The Bohr magneton is the measure of the magnitude of the magnetic dipole moment of an electron revolving around an atom with such angular momentum. According to the Bohr model, this is the ground state, or the state with the lowest possible energy.