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Which of the following statements is correct for diamagnetic materials? - Physics

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प्रश्न

Which of the following statements is correct for diamagnetic materials?

पर्याय

  • μr < 1

  • χ is negative and low

  • χ does not depend on temperature

  • All of the above

MCQ
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उत्तर

All of the above.

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पाठ 11: Magnetic Materials - Exercises [पृष्ठ २६३]

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बालभारती Physics [English] Standard 12 Maharashtra State Board
पाठ 11 Magnetic Materials
Exercises | Q 1.3 | पृष्ठ २६३

संबंधित प्रश्‍न

Distinguish between ‘paramagnetic’ and ‘ferromagnetic’ substances.


Give any ‘two’ points of differences between diamagnetic and ferromagnetic substances.


An iron rod of the area of cross-section 0.1m2 is subjected to a magnetizing field of 1000 A/m. Calculate the magnetic permeability of the iron rod. [Magnetic susceptibility of iron = 59.9, magnetic permeability of vacuum = 4π x 10-7 S. I. unit]  


In what way is the behaviour of a diamagnetic material different from that of a paramagnetic, when kept in an external magnetic field?


Show diagrammatically the behaviour of magnetic field lines in the presence of (i) paramagnetic and (ii) diamagnetic substances. How does one explain this distinguishing feature?


Explain Curie’s law for a paramagnetic substance.


Draw magnetic field line when a (i) diamagnetic, (ii) paramagnetic substance is placed in an external magnetic field. Which magnetic property distinguishes this behaviour of the field line due to the substances?


Answer the following question.
Write three points of differences between para-, dia- and ferromagnetic materials, giving one example for each. 


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 ______.


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


A paramagnetic gas has 2.0 × 1026 atoms/m with atomic magnetic dipole moment of 1.5 × 10−23 A m2 each. The gas is at 27°C.

  1. Find the maximum magnetization intensity of this sample.
  2. If the gas in this problem is kept in a uniform magnetic field of 3 T, is it possible to achieve saturation magnetization? Why?

A rod of magnetic material of cross-section 0.25 cm2 is placed in a magnetizing field of intensity 4000 A/m-1. The magnetic flux passing through the rod is 25 × 10-6 Wb. Find out

(a) relative permeability

(b) magnetic susceptibility and 

(c) magnetisation of the rod.


Two identical bar magnets each of magnetic moment M, separated by some distance are kept perpendicular to each other. The magnetic induction at a point at the same distance d from the centre of magnets, is (µ0 = permeability of free space)


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


The magnetic susceptibility of a paramagnetic material at - 73 °C is 0.0075. Its value at -173 °C will be ______.


All atoms of a magnetic substance have a resultant magnetic moment even in absence of external magnetic field. The substance is ______.


Magnetization of the sample is ______.


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


There are three needles 'N1', 'N2' and 'N3' made of a ferromagnetic, a paramagnetic and a diamagnetic substance respectively. When a magnet is brought close to them, then it will ____________.


The materials having negative magnetic susceptibility are ____________.


The product of magnetic susceptibility (`chi`) and absolute temperature (T) is constant for a ____________.


Above the curie temperature the susceptibility of ferromagnetic substance varies ____________.


A small quantity of paramagnetic liquid is taken in a watch - glass and kept on two dissimilar magnetic poles. The liquid ____________.


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 is diamagnetism, in contrast, almost independent of temperature?


If a toroid uses bismuth for its core, will the field in the core be (slightly) greater or (slightly) less than when the core is empty?


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?


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


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


Nickel shows ferromagnetic property at room temperature. If the temperature is increased beyond curie temperature, then it will show ______.


The given figure represents a material which is ______.


Assertion: The ferromagnetic substance do not obey Curie’s law.
Reason: At Curie point a ferromagnetic substance start behaving as a paramagnetic substance.


When the temperature of a magnetic material decreases, the magnetization ______.

Metals getting magnetised by orientation of atomic magnetic moments in external magnetic field are called ______.


Curie temperature is the temperature above which ______.

A material is placed in a magnetic field and it is thrown out of it. Then the material is ______.

Which of the following property shows the property of ferromagnetic substances?


When a ferromagnetic material is created above its curie temperature


A hydrogen atom is paramagnetic. A hydrogen molecule is


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


According to the Atomic theory, on heating a magnet, the thermal energy of the elementary magnet ______


S is the surface of a lump of magnetic material.

  1. Lines of B are necessarily continuous across S.
  2. Some lines of B must be discontinuous across S.
  3. Lines of H are necessarily continuous across S.
  4. Lines of H cannot all be continuous across S.

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.

Essential difference between electrostatic shielding by a conducting shell and magnetostatic shielding is due to ______.

  1. electrostatic field lines can end on charges and conductors have free charges.
  2. lines of B can also end but conductors cannot end them.
  3. lines of B cannot end on any material and perfect shielding is not possible.
  4. shells of high permeability materials can be used to divert lines of B from the interior region.

Explain quantitatively the order of magnitude difference between the diamagnetic susceptibility of N2 (~5 × 10–9) (at STP) and Cu (~10–5).


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

Which of the following has a permeability less than that of free space?


The relative magnetic permeability of a substance X is slightly less than unity and that of substance Y is slightly more than unity, then ______.


State the dimensions of magnetization.


Explain the Domain theory in brief.


Explain the meaning of the following statement:

Curie temperature for soft iron is 770°C.


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