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A: Diamagnetism is almost indipendent of...

A: Diamagnetism is almost indipendent of temperature.
R: The induced dipole moment in a diamagnetic sample is always opposite to the magnetising field irrespective of what the internal motion of the atom is .

A

If both Assertion & Reason are the true and the reason is the correct explanation of the assertion, then mark (1)

B

If both Assertion & Reason are true but the reson is not the correct explanation of the assertion, then mark (2)

C

If Assertion is true statement but Reason is false, then mark (3)

D

If both Assertion and Reason are false statements, then mark (4)

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Assertion: Diamagnetism is universal, it is present in all materials Reason: Field due to induced magnetic moment is opposite to the magnetising field.

What is the net magnetic moment of an atom of a diamagnetic material?

A: Paramagnetic sample displays greater magnetisation (for the magnetizing field) when cooled. R: The tendency to disrupt the alignment of dipoles (with the magnetising field) arising from random thermal motion is reduced at lower temperatures.

Answer the following questions: (a) Why does a paramagnetic sample display greater magnetization (for the same magnetizing field) when cooled. (b) Why is diamagnetism, in contrast, almost independent of temperature? (c) 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? (d) Is the permeability of a ferromagnetic material independent of the magnetic field? If not, is it more for lower or higher fields? (e) Magnetic field lines are always nearly normal to the surface of a ferromagnet at every point (This fact is analogous to the static electric field lines being normal to the surface of a conductor at every point). Why? (f) Would the maximum possible magnetization of a paramagnetic sample be of the same order of magnitude as the magnetization of a ferromagnet?

(a) Magnetic field lines show the directions (at every point) which a small magnetised needle takes up (at that point). Do the magnetic field lines also represent the lines of force of a moving charged particle at every point? (b) Magnetic field lines can be entirely confined within the core of a toroid, but not within a straight solenoid. Why? (c) If magnetic monopoles existed, how would Gauss's law of magnetism be modified? (d) Does a bar magnet exert a torque on itself due to its own field? Does one element of a current carrying wire exert a force on another element of the same wire? (e) Magnetic field arises due to charges in motion. Can a system have magnetic moment even though its net charge is zero? (f) Magnetic force is always normal to the velocity of a charge and therefore does no work. An iron nail held near a magnet, when released, increases its kinetic energy as it moves to cling to the magnet. What agency is responsible for this increase in kinetic energy if not the magnetic field?

AAKASH INSTITUTE-MAGNETISM AND MATTER -ASSIGNMENT (SECTION D)
  1. A: A bar magnet does not exert a torque on itself due to its own field...

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  2. A: A system can have magnetic moments even though its net charge is ze...

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  3. A: The earth's magnetic field not only varies from point to point in s...

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  4. A : In earn may nave even reversea the direction of its field several ...

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  5. A: The earth's field departs from its dipole shape substantially at la...

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  6. A: Paramagnetic sample displays greater magnetisation (for the magneti...

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  7. A: Diamagnetism is almost indipendent of temperature. R: The induced...

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  8. A: If a toroid uses bismuth for its core, then the field in the core w...

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  9. A: Peramability of a ferromagnetic material is independent of the magn...

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  10. A: The maximum possible magnetization of a paramagnetic sample is of t...

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  11. A: A system displaying a hysteresis loop such as a ferromagnet, is a d...

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  12. A: Ceramics (specially treated barium iron oxides) also called ferrite...

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  13. A: magnetic field lines are continuous and form closed loops. R: Mag...

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  14. A: Superconductors are perfect diamagnetic. R: Superconductors are p...

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  15. A: Superconducting magnets are gainfully exploited in running magnetic...

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  16. A: Diamagnetism is exhibited by all the substances. R: Diamagentism ...

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  17. A: Above curie-point a ferromagnetic substance behaves as a paramagnet...

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  18. A: Earth's magnetism protects us from many of thte harmful cosmic rays...

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  19. A: In a diamagnetic substance each atom has a non-zero dipole moment b...

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  20. A: The magnetic field lines have a tendency to avoid entering the body...

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