When a paramagnetic substance is placed in a uniform magnetic field, the magnetic field lines?
The atoms of a paramagnetic material possess a permanent magnetic dipole moment of their own. On account of the ceaseless random motion of the atoms, no net magnetization is seen. In the presence of an external field B0, which is strong enough, and at low temperatures, the individual atomic dipole moment can be made to align and point in the same direction as B0.
The field lines get concentrated inside the material and the field inside is enhanced.