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Q.

A paramagnetic sample shows a net magnetisation of 8 A/m when placed in an external magnetic field of 0.6T at a temperature of 4K.When the same sample is placed in an external magnetic field of 0.2T at a temperature of 16K , the mangnetisation will be:

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a

323 A/m

b

23 A/m

c

6 A/m

d

2.4 A/m

answer is B.

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Detailed Solution

As  I=χmH and χm=CT  (Curie law)I=CHT or I1I2=CH3/T1CH2/T2=H1H2T2T1orM2=M1H2H1T1T2=8(A/m)0.2T0.6T4K16K= 23 A/m
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