Question

define bohr magnetron

Answer 1

it is a physical constant and the natural unit for expressing for magnetic moment of an electron caused by either its orbital or spin angular momentum.

Answer 2

°°°°BOHR MAGNETRON••

For an electron revolving in an atom, the angular momentum is quantized as proposed by Niels Bohr.

angular momentum = nh/2π

Where
n = orbit quantum number
h = Planck’s constant,

μ = n −e2me h2π

μ = −n eh4πme

The quantity that multiplies with n is a constant known as the Bohr Magneton μB,

μB = eh4πme = 9.27 × 10−27 J⁄T

The Bohr Magneton is used to express magnetic moments!
it is denoted by BM or μB

hope this helps!!