Question

    Which of the following principle is used to produce

    low-temperatures'?
    A Super conductivity Correct Answer Incorrect Answer
    B Joule-Kelvin effect Correct Answer Incorrect Answer
    C Thermo-electric effect Correct Answer Incorrect Answer
    D Adiabatic demagnetization Correct Answer Incorrect Answer

    Solution

    Magnetic refrigeration is a cooling technology based on the magneto- caloiic effect. This technique can be used to attain extremely low temperatures, as well as the ranges used in common refrigerators, depending on the design of the system. The magneto- caloric effect (MCE, from magnet and calorie) is a magneto-thermodynamic phenomenon in which a change in temperature of a suitable material is caused by exposing the material to a changing magnetic field.

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