Correct Answer: Adiabatic demagnetisation

Solution : The correct option is Adiabatic demagnetisation .

To achieve low temperatures, an adiabatic demagnetisation method is helpful. This technique helps to achieve low temperatures of around 1K for the electronic paramagnetic salts. However, the temperature can be as low as possible for the nuclear paramagnets. There are numerous compounds or elements known as nuclear paramagnets that have no magnetic moments but do have magnetic moments in their nuclei. For magnetic refrigeration, these magnetic moments are helpful.