A long solenoid has 1000 turns per metre and | vedclass

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(A) The magnetic field intensity $H$ inside a long solenoid is given by $H = nI$,where $n$ is the number of turns per unit length and $I$ is the curre

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

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(A) The magnetic field intensity $H$ inside a long solenoid is given by $H = nI$,where $n$ is the number of turns per unit length and $I$ is the current. Since $n$ and $I$ do not change,the $H$ field remains nearly unchanged.The magnetic induction $B$ is given by $B = \mu H = \mu_0 \mu_r H$. Here,$\mu_r$ is the relative permeability of the core material.When the soft iron core is heated beyond the Curie temperature $(T_C)$,it undergoes a phase transition from a ferromagnetic state to a paramagnetic state.For a ferromagnetic material,$\mu_r$ is very large (e.g.,$1000$). For a paramagnetic material,$\mu_r$ is very close to $1$.Since $\mu_r$ drops drastically from a large value to approximately $1$,the magnetic field $B$ inside the solenoid decreases drastically.

$A$ 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 the Curie temperature,$T_C$.

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