An electron orbiting around a nucleus has angular momentum L. The magnetic field produced by the electron at the centre of the orbit can be expressed as :

An electron moving around the nucleus with an angular momenturm l has a magnetic moment

An electron moving around the nucleus with an angular momenturm l has a magnetic moment

An electron moving around the nucleus with the an angular momentum l has a magnetic moment

Single electron is orbiting in n^(th) orbit of hydrogen atom. The magnetic field produced by the electron at the nucleus will be proportional to n^(-k) . Find the value of k.