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Explain the magnetization of a material.

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प्रश्न

Explain the magnetization of a material. 

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उत्तर

Magnetization:

  1. The ratio of magnetic moment to the volume of the material is called magnetization.
  2. It is denoted by `vec"M"`.
  3. If a magnetic specimen of volume ‘V’ acquires net magnetic dipole moment ‘mnet’ due to the magnetizing field, then `vec"M" = "m"_"net"/"V"`
  4. It is a vector quantity.
  5. Unit: Am-1 in SI system.
  6. Dimensions: [M0 L-1 T0 I1]    
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अध्याय 11: Magnetic materials - Short Answer II

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संबंधित प्रश्न

What is Magnetization?


The magnetic moment of a magnet of dimensions 5 cm × 2.5 cm × 1.25 cm is 3 Am2. Calculate the intensity of magnetization.


State formula and S.I. unit of Magnetization.


Find the magnetization of a bar magnet of length 10 cm and cross-sectional area 4 cm2, if the magnetic moment is 2 Am2.


Which of the following pairs has quantities of the same dimensions?
(a) Magnetic field B and magnetising field intensity H
(b) Magnetic field B and intensity of magnetisation I
(c) Magnetising field intensity H and intensity of magnetisation I
(d) Longitudinal strain and magnetic susceptibility


The magnetic field inside a long solenoid of 50 turns cm−1 is increased from 2.5 × 10−3 T to 2.5 T when an iron core of cross-sectional area 4 cm2 is inserted into it. Find (a) the current in the solenoid (b) the magnetisation I of the core and (c) the pole strength developed in the core.


At a certain temperature, a ferromagnetic material becomes paramagnetic. What is this temperature called?


Answer the following question.
Define the term "Intensity" in the photon picture of electromagnetic radiation.


The moment of a magnet (15 cm × 2 cm × 1 cm) is 1.2 A-m2. What is its intensity of magnetization?  


Define magnetic intensity.


A magnet of magnetic moment 3Am2 weighs 75 g. The density of the material of the magnet is 7500 kg/m3. what is magnetization? 


Derive the relation between magnetic field intensity(H) and magnetization(M) for a magnetic material placed in a magnetic field. 


An electron moves in a circular orbit with uniform speed v. It produces a magnetic field B at the centre of the circle. The radius of the circle is [µ0 = permeability of free space, e = electronic charge]


The magnetic susceptibility is given by ______


A solenoid has core of a material with relative permeability 500 and its windings carry a current of 2 A. The number of turns of the solenoid is 500 per metre. The magnetization of the material is ______.


A bar magnet has coercivity 6 x 103 Am-1. It is desired to demagnetise it by inserting it inside a solenoid 10 cm long and having 40 turns. The current that should be sent through the solenoid is ____________.


The magnetic field (B) inside a long solenoid having 'n', turns per unit length and carrying current 'I' when iron core is kept in it is (`mu_0` = permeability of vacuum, `chi` = magnetic susceptibility) ____________.


A magnet of magnetic moment 6 Am2 weighs 65 g. The density of the material of the magnet is 6500 kg/m3. What is the magnetization?


SI Unit of Magnetization is ____________.


Two parallel wires of equal lengths are separated by a distance of 3m from each other. The currents flowing through first and second wire is 3A and 4.5A respectively in opposite directions. The resultant magnetic field at the mid-point of both wire is (µ0 = permeability of free space).


Assertion: Susceptibility is defined as the ratio of intensity of magnetisation I to magnetic intensity H.

Reason: Greater the value of susceptibility, smaller the value of intensity of magnetisation I.


What is the magnetization of a bar magnet having length 5 cm and area of cross section 2 cm2? (M = 1 Am2)


If Mz = magnetization of a paramagnetic sample, B external magnetic field, T = absolute temperature, C = curie constant then according to Curie's law in magnetism, the correct relation is ______.


The relative magnetic permeability (`mu_"r"`) of a substance is related to its susceptibility (`chi`) as ____________.


A bar magnet having length 5 cm and area of cross-section 4cm2 has magnetic moment 2Am2. If magnetic susceptibility is 5 x 10-6, the magnetic intensity will be ____________.


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The variation of intensity of magnetization (I) and applied magnetic field intensity (H) for three magnetic materials A, B, C are shown in the graph. The material A is ____________.


Magnetization of a sample is ______.


If `vec"H"` = magnetic intensity, `chi` = susceptibility, magnetic moment per unit volume `vec"M"` equals ______.


Magnetic lines of force due to a bar magnet do not intersect because ______.


One can define ...A... of a place as the vertical plane which passes through the imaginary line joining the magnetic North and the South–poles. Here, A refers to ______.


The ratio of intensity of magnetisation and magnetising field is called ______.

Susceptibility is positive and large for a ______.

Which of the following is not correct about relative magnetic permeability (μ,)?

Magnetic permeability is maximum for ______


What are the dimensions of χ, the magnetic susceptibility? Consider an H-atom. Guess an expression for χ, upto a constant by constructing a quantity of dimensions of χ, out of parameters of the atom: e, m, v, R and µ0. Here, m is the electronic mass, v is electronic velocity, R is Bohr radius. Estimate the number so obtained and compare with the value of |χ| ~ 10–5 for many solid materials.


What is magnetic susceptibility?


A bar magnet has length 3 cm, cross-sectional area 2 cm3 and magnetic moment 3 Am2. The intensity of magnetisation of bar magnet is ______.


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The magnetic susceptibility of iron is 5499. The relative permeability of iron will be ______.


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