A long solenoid has 1000 turns per meter and carries a current of 1 A.

Question:

A long solenoid has 1000 turns per meter and carries a current of 1 A. It has a soft iron core of μr = 1000. The core is heated beyond the Curie temperature Tc

(a) the H field in the solenoid is unchanged but the B field decreases drastically

(b) the H and B fields in the solenoid are nearly unchanged

(c) the magnetisation in the core reverses direction

(d) the magnetisation in the core diminishes by a factor of about 108

Solution:

(a) the H field in the solenoid is unchanged but the B field decreases drastically

(d) the magnetisation in the core diminishes by a factor of about 108

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