A magnet is in contact with a reservoir that keeps it at 300 K. The magnet has a magnetic moment µz = 10−3 J/T and is sitting in an external field oriented along the z-axis of strength Bz = 0.1 T. The external field is increased by 1%, and the induced magnetic moment also increases by 1%.
(a) What is the change in entropy?
(b) By what factor does the number of accessible states change?
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