The magnetic moment (μ) of an electron revolving around the nucleus, varies with principal quantum number n as,
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Solution
Magnetic moment (μ) of a revolving electron around the nucleus varies with principle quantum number as, μn=eL2m
According to second postulate of Bohr's theory, L=nh2π
∴μ=enh4πm
Here, e→ charge of an electron n→ principle quantum number h→ Planck's constant m→ mass of electron
So, we can write, μ∝n
Hence, (A) is the correct answer.
Why this question ?
This question is based on magnetic moment of an electron revolving around the nucleus and angular momentum of an electron in the nth orbit.