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Magnetic field lines...

Magnetic field lines

A

cannot intersect at all

B

intersect at infinity

C

intersect within the magnet

D

intersect at the neutral points

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The correct Answer is:
A, B, C, D
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a. Magnetic field lines show the direction (at every point) along which a small magnetised needle aligns (at the point) Do the magnetic field also represent the lines of force one 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 the Gauss ' 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 moments eventhough its charge is zero ?

Answer the following questions . a. Why does a paramagnetic sample display greater magnetisation (for the same magnetising field) when cooled ? b. Why is diamagnetism , in contrast , almost independent of temperature ? c. If a toroid uses bismuth for its core, will the 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 ferreomgnet at every point . (This fact is analogous to the static electric field lines being normal to the surface of conductor at every point). Why ? f. Would the maximum possible magnetisation of paramagnetic sample be of the same order of magnitude as the magnetisation of ferromagnet ?

Many of the diagrams given in figure show magnetic field lines (thick lines in the figure ) wrongly. Point out what is wrong with them . Some of them may describe electrostatic field lines correctly. Point out which ones.

Depending on the magnetic property, the materials are classified into diamagnetic , paramagnetic and ferromagnetic. a. The behaviour of magnetic field lines near a magnetic substance is shown in thte figure . Which material corresponds to the figure. b. State and explain Curie's law. c. Compare paramagnetism and Ferro magnetism . Give examples of each .

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FULL MARKS-MAGNETISM AND MAGNETIC EFFECTS OF ELECTRIC CURRENT -ADDITIONAL QUESTIONS SOLVED
  1. Source (s ) of a mangnetic field is (are)

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  2. Magnetic field lines

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  3. A magnetic needle is kept in a non-uniform magnetic field. It experien...

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  4. The unit of pole strength ( magnetic charge ) is .

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  5. Earth's magnetic field always has horizontal component except at

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  6. The angle of dip at the magnetic equator is

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  7. At a certain place the horizontl component of earth's magnetic field i...

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  8. At magnetic poles the angle of dip is

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  9. The horizontal component of earth's magnetic field at a place is 3.6 x...

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  10. A bar magnet of magnetic moment M is cut into two parts of equal lengt...

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  11. A magnetic needle suspended by a silk thread is vibrating in the earth...

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  12. Demagnetisation of a magnet can be done by

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  13. All the magnetic materials lose their magnetic properties when

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  14. The relative permeability of a paramagnetic material is

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  15. The relative permeability of a diamagnetic material is

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  16. Which of the following is most suitable for the core of an electromagn...

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  17. Soft iron is used in many parts of electrical machines for

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  18. When a diamagnetic substance is brough near the north or the south pol...

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  19. At Curie point, a ferromagnetic material becomes

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  20. Magnetic permeability is maximum for

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