The magnetic moment $\left(\mathrm{\mu }\right)$ of a revolving electron around the nucleus varies with principal quantum number n as

(a) $\mathrm{\mu }\propto \mathrm{n}$             (b) $\mathrm{\mu }\propto 1/\mathrm{n}$
(c) $\mathrm{\mu }\propto {\mathrm{n}}^{2}$            (d) $\mathrm{\mu }\propto 1/{\mathrm{n}}^{2}$

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