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The Bohr magneton is given by

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in Electromagnetic Theory by (188k points)
The Bohr magneton is given by

(a) eh/2m

(b) eh/2πm

(c) eh/4m

(d) eh/4πm

The question was asked by my school principal while I was bunking the class.

Question is taken from Magnetic Dipole topic in division Magnetic Forces and Materials of Electromagnetic Theory

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The correct choice is (d) eh/4πm

The best I can explain: In atomic physics, the Bohr magneton (symbol μB) is a physical constant and the natural unit for expressing the magnetic moment of an electron caused by either its orbital or spin angular momentum. It is given by eh/4πm, where h is the Planck’s constant, e is the charge of the electron and m is the mass of the electron.

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