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कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान 2nd PUC Class 12

Why is diamagnetism, in contrast, almost independent of temperature?

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प्रश्न

Why is diamagnetism, in contrast, almost independent of temperature?

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उत्तर

Each molecule of the diamagnetic material is not a magnetic dipole in itself. Hence, the random thermal motion of the molecules of the diamagnetic material (which is related to the temperature) does not affect the diamagnetism of the material.

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पाठ 5: Magnetism and Matter - Exercise [पृष्ठ २०२]

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एनसीईआरटी Physics Part I and II [English] Class 12
पाठ 5 Magnetism and Matter
Exercise | Q 5.16 (b) | पृष्ठ २०२

संबंधित प्रश्‍न

Distinguish between ‘paramagnetic’ and ‘ferromagnetic’ substances.


The susceptibility of a magnetic material is 0·9853. Identify the type of magnetic material. Draw the modification of the field pattern on keeping a piece of this material in a uniform magnetic field.


The susceptibility of a magnetic material is − 2.6 × 10−5. Identify the type of magnetic material and state its two properties.


The relative magnetic permeability of a magnetic material is 800. Identify the nature of magnetic material and state its two properties.


Choose the correct option:

A rectangular magnet suspended freely has a period of oscillation equal to T. Now it is broken into two equal halves (each having half of the original length) and one piece is made to oscillate freely. Its period of oscillation is T′, the ratio of T′/T is ______.


If a magnetic field is applied to a liquid in one arm of a narrow U-tube, the liquid level in that arm is lowered. The liquid in U-tube arm is ______.


The earth’s field departs from its dipole shape substantially at large distances (greater than about 30,000 km). What agencies may be responsible for this distortion?


A short bar magnet has a magnetic moment of 0.48 J T−1. Give the direction and magnitude of the magnetic field produced by the magnet at a distance of 10 cm from the centre of the magnet on

  1. the axis,
  2. the equatorial lines (normal bisector) of the magnet.

Is the permeability of a ferromagnetic material independent of the magnetic field? If not, is it more for lower or higher fields?


Magnetic field lines are always nearly normal to the surface of a ferromagnet at every point. (This fact is analogous to the static electric field lines being normal to the surface of a conductor at every point.) Why?


What kind of ferromagnetic material is used for coating magnetic tapes in a cassette player, or for building ‘memory stores’ in a modern computer?


A certain region of space is to be shielded from magnetic fields. Suggest a method.


The magnetic susceptibility is negative for ______.


When a ferromagnetic material is created above its curie temperature


From molecular view point, discuss the temperature dependence of susceptibility for diamagnetism, paramagnetism and ferromagnetism.


A uniform magnetic field gets modified as shown in figure when two specimens A and B are placed in it.

(a) (b)
  1. Identify the specimen A and B.
  2. How is the magnetic susceptibility of specimen A different from that of specimen B?

Magnetic susceptibility for a paramagnetic and diamagnetic materials is respectively ______.


An ammeter of resistance R gives a full-scale deflection when a current of 2 A passes through it. If it is measured with a maximum current of 10 A, the required shunt is ______.


Which of the following cannot modify an external magnetic field as shown in the figure?

 


Explain the meaning of the following statement:

Curie temperature for soft iron is 770°C.


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