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प्रश्न
The permanent magnetic moment of the atoms of a material is not zero. The material ________________ .
विकल्प
must be paramagnetic
must be diamagnetic
must be ferromagnetic
may be paramagnetic
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उत्तर
may be paramagnetic
Diamagnetic material have zero magnetic moment on their own.
Paramagnetic and ferromagnetic materials have non zero permanent magnetic moment. But we are not sure about the material, whether it is Paramagnetic or ferromagnetic. If the material has large value of permanent magnetic moment, then it will be ferromagnetic and if it has small value of permanent magnetic moment, then it will be Paramagnetic.
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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 kept in a magnetic field. The field is increased till the magnetisation becomes constant. If the temperature is now decreased, the magnetisation ___________ .
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 zero. The material _________________ .
When a ferromagnetic material goes through a hysteresis loop, the magnetic susceptibility
(a) has a fixed value
(b) may be zero
(c) may be infinity
(d) may be negative
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 ______.
Which of the following is not showing the essential difference between electrostatic shielding by a conducting shell and magnetostatic shielding?
