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A long solenoid has 1000 turns per metre...

A long solenoid has 1000 turns per metre and carries a current of 1 A . It has a soft iron core of `mu_(r)=1000` . The core is heated beyond Curie temperature `T_(c)` .

A

The `vec(H)` field in the solenoid is almost unchanged but the `vec(B)` field reduces drastically .

B

The `vec(H) and vec(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 `10^(8)` .

Text Solution

Verified by Experts

The correct Answer is:
A, D
`H=nIandB=mu_(0)mu_(r)nI`
As `mu_(r)` changes B will not .
when the core is heated beyond Curie point , it behaves like a paramagnetic material .
`(X_("ferro"))/(X_("para"))=(10^(3))/(10^(-5))=10^(8)`
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