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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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एससीईआरटी महाराष्ट्र Physics [English] 12 Standard HSC
अध्याय 11 Magnetic materials
Short Answer II | Q 1.2

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संबंधित प्रश्न

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.


Give two points to distinguish between a paramagnetic and a diamagnetic substance ?


A long, straight wire carries a current i. The magnetising field intensity H is measured at a point P close to the wire. A long, cylindrical iron rod is brought close to the wire, so that the point P is at the centre of the rod. The value of H at P will ______________ .


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


Mark out the correct options.
(a) Diamagnetism occurs in all materials.
(b) Diamagnetism results from the partial alignment of permanent magnetic moment.
(c) The magnetising field intensity, H, is always zero in free space.
(d) The magnetic field of induced magnetic moment is opposite the applied field.


The magnetic intensity H at the centre of a long solenoid carrying a current of 2.0 A, is found to be 1500 A m−1. Find the number of turns per centimetre of the solenoid.


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.


The magnetic field B and the magnetic intensity H in a material are found to be 1.6 T and 1000 A m−1, respectively. Calculate the relative permeability µr and the susceptibility χ of the material.


Assume that each iron atom has a permanent magnetic moment equal to 2 Bohr magnetons (1 Bohr magneton equals 9.27 × 10−24 A m2). The density of atoms in iron is 8.52 × 1028 atoms m−3. (a) Find the maximum magnetisation I in a long cylinder of iron (b) Find the maximum magnetic field B on the axis inside the cylinder.


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.


When a plate of magnetic material of size 10 cm × 0.5 cm × 0.2 cm (length, breath, and thickness respectively) is located in a magnetizing field of 0.5 × 104 A/m-1, then a magnetic moment of 0.5 Am2 is induced in it. Find the magnetic induction in the plate.


What is the magnetization of a bar magnet having a length of 6 cm and the area of cross-section 5 cm2?


A magnetic material of susceptibility 3 × 10−4, and magnetic intensity is 4 × 104 Am1. Then The magnetization in the units of Am1 is ______.


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


A solenoid has a core of material with relative permeability 500 and its windings carry a current of 1 A. The number of turns of the solenoid is 500 per meter. Calculate the magnetization of the material. 


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. 


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


A steel wire of length I has a magnetic moment M. It is then bent into a semicircular arc. The new magnetic moment is ______.


Relative permeability of nickel is 550, then its magnetic susceptibility will be ____________.


An iron rod of cross-sectional area 6 sq. cm is placed with its length parallel to a magnetic field of intensity 1200 Alm. The flux through the rod is 60 x 10-4 Wb. The permeability of the rod is ______.


Coercivity of a magnet where the ferromagnet gets completely demagnetized is 6 x 103 Am-1. The minimum current required to be passed in a solenoid having 2000 turns per metre, so that the magnet gets completely demagnetized when placed inside the solenoid 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 ____________.


An iron rod is placed parallel to magnetic field of intensity 4000 A/m. The magnetic flux through the rod is 8 x 10-4 Wb and its cross-sectional area is 4 cm2 . The magnetic permeability of the rod in Wb/A - m is ____________.


The permeability of a metal is 0.01256 TmA- 1  What is its relative permeability?


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) ____________.


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).


A cylindrical magnetic rod has length 5 cm and diameter 1 cm. It has uniform magnetization `5.3 xx 10^3 "A"/"m"^3`. Its net magnetic dipole moment is nearly `(pi = 22/7)`.


The dimensions of the relative magnetic permeability of the substance are ______.


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.


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 ____________.


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


If μ0 is absolute permeability of vacuum and μr is relative magnetic permeability of another medium, then permeability μ of the medium is ______.

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

The magnetic susceptibility for diamagnetic materials is ______.

Magnetic permeability is maximum for ______


Define magnetization.


An example of a perfect diamagnet is a superconductor. This implies that when a superconductor is put in a magnetic field of intensity B, the magnetic field B inside the superconductor will be such that ______.


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 ______.


State unit and dimensions of Magnetic susceptibility.


The dimensions of magnetic intensity are ______.


The magnetization of a bar magnet of length 4 cm, cross-sectional area 1 cm2 and magnetic moment 2 SI units is ______.


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