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

Curie's law can be written as

Suppose a small cylinder of a paramagnetic substance and a small cylinder of a diamagnetic substance are placed between the (parallel) pole pieces of a strong magnet,so that they are aligned along the direction of the field lines. Will they attract or repel each other?

$A$ sensitive magnetic instrument can be shielded very effectively from outside magnetic fields by placing it inside a box of

Which of the following materials exhibits diamagnetism?

Vedclass Test Series

Exam Paper Generator

Online Exam Module