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Questions  

Which of the following is incorrect

a
Lesser area of hysteresis loop indicates lesser loss of heat
b
Hysteresis loop is not shown by diamagnetic substance
c
Curie temperature is the temperature above which ferromagnetic material becomes diamagnetic material
d
Water, NaCl and lead all are the examples of diamagnetic substances

detailed solution

Correct option is C

Above curie temperature ferromagnetic substances behaves as paramagnetic substances

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A paramagnetic sample shows a net magnetization of 6 A/m when it is placed in an external magnetic field of 0.4 T at a temperature of 4 K. When the sample is placed in an external magnetic field of 0.3 T at a temperature of 24 K, then the magnetization will be:


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