when placed in
an external magnetic field of 
at a
temperature of 4 K. When the same sample is placed in an external magnetic
field of 
at a temperature of 16 K, the
magnetisation will be
(a) 
(b) 
(c) 
(d) 
Answer:
(b)Here, 
= 8 
; 
= 0.6 T, 
= 4 K ; 
= ?, 
= 
T,
= 16 K
According
to Curie law,
or
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