Moving Charges And Magnetism

Assuming the atom is in the ground state, the expression for the magnetic field at a point nucleus in hydrogen atom due to circular motion of electron is [\(\mu_0=\) permeability of free space, \(\mathrm{m}=\) mass of electron, \(\epsilon_0=\) permittivity of free space, \(\mathrm{h}=\) Planck's constant ]