The relative permeability (mu_r) of a ferroma | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(C) For a ferromagnetic substance,the relative permeability $(\mu_r)$ is very large at low temperatures.As the temperature $(T)$ increases,the thermal

Vedclass · Accepted Answer

$C$

Vedclass · Answer

(C) For a ferromagnetic substance,the relative permeability $(\mu_r)$ is very large at low temperatures.As the temperature $(T)$ increases,the thermal agitation of the atoms increases,which opposes the alignment of magnetic dipoles.When the temperature reaches the Curie temperature $(T_c)$,the substance undergoes a phase transition from ferromagnetic to paramagnetic.Above the Curie temperature $(T_c)$,the substance behaves as a paramagnetic material,for which the relative permeability $(\mu_r)$ is slightly greater than $1$ and remains nearly constant with further increases in temperature.Curve $C$ correctly represents this behavior,where $\mu_r$ is high at low temperatures and decreases to a value slightly above $1$ at $T = T_c$,remaining constant thereafter.

The relative permeability $(\mu_r)$ of a ferromagnetic substance varies with temperature $(T)$ according to the curve shown in the figure.

Similar Questions

In a permanent magnet at room temperature,

The magnetic susceptibility $\chi$ for superconductors is . . . . . . .

In a ferromagnetic material,below the Curie temperature,a domain is defined as:

$A$ 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,$T_C$.

The magnetic susceptibility of a paramagnetic substance is:

Vedclass Test Series

Exam Paper Generator

Online Exam Module