Bohr magneton is given by (symbols have their usual meanings)
  • A$\frac{4 \pi m_e}{e h^2}$
  • B$\frac{4 \pi m_e}{e h}$
  • C$\frac{e h^2}{4 \pi m_e}$
  • D$\frac{e h}{4 \pi m_e}$
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