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कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान 2nd PUC Class 12

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

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प्रश्न

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

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उत्तर

Ceramic is used for coating magnetic tapes in cassette players and for building memory stores in modern computers.

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  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 5: Magnetism and Matter - Exercise [पृष्ठ २०२]

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एनसीईआरटी Physics Part I and II [English] Class 12
पाठ 5 Magnetism and Matter
Exercise | Q 5.17 (d) | पृष्ठ २०२

संबंधित प्रश्‍न

Which of the following substances is ductile?


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


The relative magnetic permeability of a magnetic material is 800. Identify the nature of magnetic material and state its two properties.


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


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.


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


Magnetization of the sample is ______.


The materials having negative magnetic susceptibility are ____________.


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.

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?


Which magnetic materials have negative susceptibility?

When a ferromagnetic material is created above its curie temperature


A hydrogen atom is paramagnetic. A hydrogen molecule is


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 ______.


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


How does the magnetic susceptibility of a paramagnetic material vary with its absolute temperature under Curie's Law?


In the small-arrows analogy for ferromagnets, when does the total effect become strong?


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