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A long solenoid has 1000 turns per metre...

A long solenoid has 1000 turns per metre and carries a curent of 1A. It has a soft iron of `mu_1 =1000`. The core is heated beyond the Curie temperature `T_c`.

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 magnetism in the core reverses direction.

D

The magnetisation in the core diminishes by a fctor of about `10^8`.

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