A long solenoid has 1000 turns per metre and carries a current of 1 A. It has a soft iron core of μr = 1000.

Monjur Alahi

A long solenoid has 1000 turns per metre 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 (nearly) 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.


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Salim Ahmed Kawsar

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(a), (d)

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

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

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