Question: Q. 2. A paramagnetic sample shows a net magnetization of 8Am1 when placed in an external magnetic field of 0.6 T at a temperature of 4 K. When the same sample is placed in an external magnetic field of 0.2 T at a temperature of 16 K, the magnetization will be (a) 323Am (b) 23Am1 (c) 6Am1 (d) 2.4Am1

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Solution:

Ans. Correct option: (b)

[NCERT Exemplar]

Explanation: According to the Curie’s law of magnetisation, the magnetic susceptibility for a substance is directly proportional to magnetic field induction (B) and inversely proportional to the absolute temperature (T).

IBT

So that,

I2I1=B2T1B1T2

Given,

I1=8Am1 B1=0.6 T T1=4 K I2=? B2=0.2 T T2=16 K

Put the values,

I2=B2T1B1T2I1=0.2×8×40.6×16=23Am1

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