Advertisements
Advertisements
प्रश्न
A paramagnetic material is kept in a magnetic field. The field is increased till the magnetisation becomes constant. If the temperature is now decreased, the magnetisation ___________ .
विकल्प
will increase
will decrease
will remain constant
may increase or decrease
उत्तर
will remain constant
Magnetisation becomes constant i.e all the magnetic moments have got aligned in the direction of the applied field. So now, if the temperature is decreased, thermal vibration of the paramagnetic material will reduce, But as all the magnetic moments are already aligned in the direction of the field so no further alignment can take place due to reduced thermal motion. Thus, there will be no negative effect of decreasing the temperature on the magnetisation.
APPEARS IN
संबंधित प्रश्न
The property of diamagnetism is said to be present in all materials. Then, why are some materials paramagnetic or ferromagnetic?
Can we have magnetic hysteresis in paramagnetic or diamagnetic substances?
When a ferromagnetic material goes through a hysteresis loop, its thermal energy is increased. Where does this energy come from?
A paramagnetic material is placed in a magnetic field. Consider the following statements:-
(A) If the magnetic field is increased, the magnetisation is increased.
(B) If the temperature is increased, the magnetisation is increased.
A ferromagnetic material is placed in an external magnetic field. The magnetic domains ______________ .
The magnetic susceptibility is negative for _____________ .
The permanent magnetic moment of the atoms of a material is not zero. The material ________________ .
A rod is inserted as the core in the current-carrying solenoid of the previous problem. (a) What is the magnetic intensity H at the centre? (b) If the magnetization I of the core is found to be 0.12 A m−1, find the susceptibility of the material of the rod. (c) Is the material paramagnetic, diamagnetic or ferromagnetic?
Assertion: The earth¢s magnetic field is due to iron present in its core.
Reason: At a high temperature magnet losses its magnetism.
The time period of oscillation of a magnet in a vibration magnetometer is 1.5 sec. The time period of oscillation of another magnet similar in size, shape and mass but having 1/4 magnetic moment than that of the 1st magnet oscillating at the same place will be ______.
The primary origin of magnetism lies in ______.
Which of the following is not showing the essential difference between electrostatic shielding by a conducting shell and magnetostatic shielding?
