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

A long solenoid has 1000 turns per meter and carries a current of 1 A. It has a soft iron core of \mu _{r}=1000. The core is heated beyond the Curie temperature, T_c.
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 magnetization in the core reverses direction.
D. The magnetization in the core diminishes by a factor of about 108

Answers (1)

The correct answer are the options (a, d)
n=1000turns m
\mu _{r}=1000 
H=nI=1000\times 1=1000
B=\mu _0 \mu _rnI=\left (\mu _0nI \right )\mu _r=K\mu _r
B\propto \mu_r
Beyond Curie Temperature, ferromagnetic substance behaves like paramagnetic substance.
(X_m)_{ferro}=10^3
(X_m)_{para}=10^{-5}
Magnetisation diminishes by 10^{-8} times.
 

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