NEET-XII-Physics
37: Magnetic Properties of Matter
- #1A 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.
(a) A and B are true.
(b) A is true but B is false.
(c) B is true but A is false.
(d) A and B are false.digAnsr: bAns : (b) 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,
`` \stackrel{\to }{I}=\frac{\stackrel{\to }{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. Hence, option
(b) is incorrect.
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