What is the full degeneracy of the `n =3` state of a H-atom in the absence of a magnetic field?

State the Gauss's law for magnetic field?

State the elements of Earth's magnetic field .

State few laws relating electric and magnetic fields.

State two evidences of the existence of earth's magnetic field.

In the absence of external magnetic field, d-orbital is

In the absence of external magnetic field, d-orbital is

State the characteristics of magnetic field lines.

Not considering the electronic spin, the degeneracy of the second excited state (n=3) of H atom is 9, while the degeneracy of the second excited state of H– is