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Magnetic Properties of Matter question

2003 · Shift 0 · Q135
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Magnetic Properties of Matter question

2003 · Shift 0 · Q135

JEE MainPhysicsMagnetic Properties of MatterMCQ+4 / −1
The magnetic lines of force inside a bar magnet
  1. A
    are from north-pole to south-pole of the magnet
  2. B
    do not exist
  3. C
    depend upon the area of cross-section of the bar magnet
  4. D
    are from south-pole to north-pole of the Magnet
View written solutionFree

Correct answer: D

  1. Recall the nature of magnetic field lines

    Magnetic field lines form closed continuous loops.

    • Outside a bar magnet, they go from north pole to south pole.
    • Therefore, inside the bar magnet, they must return from south pole to north pole.

  2. Evaluate each option

    A: "are from north-pole to south-pole of the magnet"

    • This is true for the field lines outside the magnet, not inside.
    • So, A is incorrect.

    B: "do not exist"

    • Magnetic field exists both inside and outside the magnet.
    • So, B is incorrect.

    C: "depend upon the area of cross-section of the bar magnet"

    • The direction of magnetic field lines inside a bar magnet does not depend on cross-sectional area.
    • So, C is incorrect.

    D: "are from south-pole to north-pole of the Magnet"

    • This matches the correct direction of magnetic field lines inside the bar magnet.
    • So, D is correct.

  3. Final answer

    The magnetic lines of force inside a bar magnet are from south pole to north pole.

    Hence, the correct option is: D\boxed{D}D​

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