Answer:
(a,d)In the solenoid,
H = n = a constant and changes due to variation in . When temperature of the iron
core of solenoid (which is ferromagnetic material) is raised beyond curie
temperature, then soft iron core behaves as para magnetic material. We know that
Thus
magnetisation of the core diminishes by a factor .
Hence, options (a) and (d) are correct.
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