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Question
A paramagnetic material is placed in a magnetic field. Consider the following statements:-
(A) If the magnetic field is increased, the magnetisation is increased.
(B) If the temperature is increased, the magnetisation is increased.
Options
A and B are true.
A is true but B is false.
B is true but A is false.
A and B are false.
Solution
A is true but B is false.
If the magnetic field is increased, magnetisation of paramagnetic material placed in magnetic field is also increases. Hence, option (a) is correct.
Magnetization (I) is given by,
\[\overrightarrow{I} = \frac{\overrightarrow{M}}{V}\]
As the temperature is increased, magnetic moments of paramagnetic material becomes more randomly aligned due to incresed thermal motion. This leads decrease in the magnetization I.
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