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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. iii) | पृष्ठ २६३

संबंधित प्रश्‍न

Distinguish between ‘paramagnetic’ 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]  


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?


Out of the two magnetic materials, 'A' has relative permeability slightly greater than unity while 'B' has less than unity. Identify the nature of the materials 'A' and 'B'. Will their susceptibilities be positive or negative?


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?


A meter gauge train is heading north with speed 54 km/hr in earth's magnetic field 3 x 10-4T. The e.m.f. induced across the axle joining the wheels is ..........

(a) 0.45 mV

(b) 4.5 mV

(c) 45 mV

(d) 450 m V


The magnetic susceptibility of annealed iron at saturation is 4224. Find the permeability of
annealed iron at saturation. (μ0 = 4Π × 10−7 SI unit)


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


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?


Identify the following magnetic materials :

(i) A material having susceptibility (χm) = −0⋅00015.
(ii) A material having susceptibility (χm) = 10−5

Choose the correct option:

A magnetising field of 360 Am−1 produces a magnetic flux density (B) = 0.6T in a ferromagnetic material. What is its permeability in Tm A−1?


Answer in brief.

Discuss the Curie law for paramagnetic material.


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?

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


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)


A domain in a ferromagnetic substance is in the form of a cube of side 1 µm. If it contains 8 × 1010 atoms and each atomic dipole has a dipole moment of 9 × 10-24 Am2 then the magnetisation of the domain is ______.


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


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 ____________.


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.

Which graph shows the variation of magnetic susceptibility (`chi`) with magnetizing field (H) for a paramagnetic substance?


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


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


The magnetic susceptibility is negative for ______.


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 ______.


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 ______.

Earth's magnetic field analyses has a horizontal component except at:-


A hydrogen atom is paramagnetic. A hydrogen molecule is


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 ______.


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.

A permanent magnet in the shape of a thin cylinder of length 10 cm has M = 106 A/m. Calculate the magnetisation current IM.


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


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


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


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

What is magnetic hysterisis?


Explain the origin of paramagnetism on the basis of atomic structure.


Magnetic susceptibility of a diamagnetic substance ______.


Match List-I with List-II.

  List-I (Material)   List-II (Susceptibility)
A. Diamagnetic I. χ = 0
B. Ferromagnetic II. 0 > χ ≥ −1
C. Paramagnetic III. χ >> 1
D. Non-magnetic IV. 0 < χ < ε

Choose the correct answer from the options given below:


Which substances are feebly magnetised in a direction opposite to that of the magnetising field?


What is the susceptibility of diamagnetic substances?


What is the susceptibility of paramagnetic substances?


How do ferromagnetic substances respond to a magnetic field?


How are the tiny domains oriented in an unmagnetised ferromagnetic specimen?


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