Question

Curie law xT = constant, relating magnetic susceptibility (x) and absolute temperature (T) of magnetic substance is obeyed by
(a) all magnetic substances.
(b) paramagnetic substances.
(c) diamagnetic substances.
(d) ferromagnetic substances.

Answer 1

Curie law  XT = constant is obeyed by paramagnetic substances

• Curie law : It states that the material magnetisation is directly proportional to applied magnetic field in case of paramagnetic materials.

• But the relation gets changed when the material is heated, material magnetisation is inversly proportional to applied magnetic field.

• Later by conducting various experiments Pierre Curie showed that for many  substances the susceptibility is inversely proportional to  absolute temperature

                                        $X = \frac{C}{T}$

• Here the constant c is called Curie’s constant and the relation is defined as Curie’s law

Answer 2

Curie law xT = constant, relating magnetic susceptibility (x) and absolute temperature (T) of magnetic substance is obeyed by paramagnetic substances.