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

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

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प्रश्न

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

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उत्तर

The permeability of ferromagnetic materials is not independent of the applied magnetic field. It is greater for a lower field and vice versa.

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

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

संबंधित प्रश्न

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.


Which of the following substances are diamagnetic?

Bi, Al, Na, Cu, Ca and Ni


The magnetic susceptibility of platinum is 0.0001. It's relative permeability is: 


What happens to a ferromagnetic material when its temperature increases above curie temperature?


Answer in brief.

Discuss the Curie law for paramagnetic material.


For a paramagnetic substance, the magnetic susceptibility is ______.


The susceptibility of a magnetic material is positive and small. The material is ______.


Magnetic material can be easily magnetized if magnetic susceptibility is ______.


A domain in a ferromagnetic substance is in the form of a cube of side length 1 µm. If it contains 6 x 1010 atoms and each atomic dipole has a dipole moment of 7 x 10-24 Am2, then magnetization of the domain is ____________.


Why does a paramagnetic sample display greater magnetisation (for the same magnetising field) when cooled?


Explain qualitatively on the basis of domain picture the irreversibility in the magnetisation curve of a ferromagnet.


Curie temperature is the temperature above which ______.

When a ferromagnetic material is created above its curie temperature


Most of the substance show which of the magnetic property:-


If a charged particle at rest experience no electromagnetic force


A paramagnetic sample shows a net magnetisation of 8 Am–1 when placed in an external magnetic field of 0.6 T at a temperature of 4 K. When the same sample is placed in an external magnetic field of 0.2 T at a temperature of 16 K, the magnetisation will be ______.


A long solenoid has 1000 turns per metre and carries a current of 1 A. It has a soft iron core of µr = 1000. The core is heated beyond the Curie temperature, Tc.

  1. The H field in the solenoid is (nearly) unchanged but the B field decreases drastically.
  2. The H and B fields in the solenoid are nearly unchanged.
  3. The magnetisation in the core reverses direction.
  4. The magnetisation in the core diminishes by a factor of about 108.

  • Assertion (A): Diamagnetic substances exhibit magnetism.
  • Reason (R): Diamagnetic materials do not have a permanent magnetic dipole moment.

Which substances are feebly magnetised in the direction of the magnetising field?


What happens to paramagnetic substances on cooling at the Curie temperature?


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