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महाराष्ट्र राज्य शिक्षण मंडळएचएससी विज्ञान (सामान्य) इयत्ता १२ वी

Which of the following statements is correct for diamagnetic materials?

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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

The susceptibility of magnesium at 200 K is 1.8 x 10-5. At what temperature will the susceptibility decrease by 6 x 10-6?


Distinguish between diamagnetic and paramagnetic 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.


Which of the following substances are para-magnetic?

Bi, Al, Cu, Ca, Pb, Ni


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.


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?


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


Two substances A and B have their relative permeability slightly greater and slightly less than 1 respectively. What do you conclude about A and B as far as their magnetic materials are concerned?


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?


The susceptibility of a paramagnetic material is χ at 27° C. At what temperature its susceptibility be χ/3?


Magnetization of the sample is ______.


Relative permittivity and permeability of a material are  `epsilon_"r"` and `µ_"r"` respectively. Which of the following values of these quantities are allowed for a diamagnetic material?


A sphere of gold when brought towards a powerful magnet experiences ____________.


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 ____________.


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?


Would the maximum possible magnetisation of a paramagnetic sample be of the same order of magnitude as the magnetisation 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?


A Rowland ring of mean radius 15 cm has 3500 turns of wire wound on a ferromagnetic core of relative permeability 800. What is the magnetic field B in the core for a magnetising current of 1.2 A?


The given figure represents a material which is ______.


The magnetic susceptibility is negative for ______.


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

If a diamagnetic substance is brought near north or south pole of a bar magnet, it is ______.

Of dia, para and ferromagnetism, the universal property of all substances is ______.

Core of elctromagnets are made of ferromagnetic materials which have ______.

Two identical bar magnets are fixed with their centres at a distance d apart. A stationary charge Q is placed at P in between the gap of the two magnets at a distance D from the centre O as shown in the figure. The force on the charge Q is ______.


The magnetic susceptibility for diamagnetic materials is ______.


When a ferromagnetic material is created above its curie temperature


A hydrogen atom is paramagnetic. A hydrogen molecule is


For a diamagnetic material


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.

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).


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?

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


What is magnetic hysterisis?


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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