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Magnetic Properties of Matter question

2021 · 18 Mar · Shift 2 · Q60
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  5. /2021 · 18 Mar · Shift 2 · Q60

Magnetic Properties of Matter question

2021 · 18 Mar · Shift 2 · Q60

JEE MainPhysicsMagnetic Properties of MatterMCQ+4 / −1
Which of the following statements are correct? (A) Electric monopoles do not exist whereas magnetic monopoles exist. (B) Magnetic field lines due to a solenoid at its ends and outside cannot be completely straight and confined. (C) Magnetic field lines are completely confined within a toroid. (D) Magnetic field lines inside a bar magnet are not parallel. (E) χ\chiχ=−-− 1 is the condition for a perfect diamagnetic material, where x is its magnetic susceptibility. Choose the correct answer from the options given below :
  1. A
    (A) and (B) only
  2. B
    (B) and (C) only
  3. C
    (C) and (E) only
  4. D
    (B) and (D) only
View written solutionFree

Correct answer: CORRECT STATEMENTS SHOULD BE (B), (C) AND (E). THE OPTIONS SEEM ERRONEOUS.

  1. Check statement (A):

    (A) says: Electric monopoles do not exist whereas magnetic monopoles exist.

    This is false.

    • Electric monopoles do exist: isolated positive and negative charges are electric monopoles.
    • Magnetic monopoles have not been observed in classical electromagnetism.

    Hence, (A) is incorrect.

  2. Check statement (B):

    (B) says: Magnetic field lines due to a solenoid at its ends and outside cannot be completely straight and confined.

    This is correct.

    • For a long solenoid, the field inside is approximately straight and parallel.
    • But near the ends and outside, the magnetic field lines spread out and curve.
    • So they are not completely straight and confined there.

    Hence, (B) is correct.

  3. Check statement (C):

    (C) says: Magnetic field lines are completely confined within a toroid.

    This is taken as correct in the ideal/JEE sense.

    • In a toroid, the magnetic field is essentially confined to the core.
    • Outside the toroid, the field is negligibly small (ideally zero).

    Hence, (C) is correct.

  4. Check statement (D):

    (D) says: Magnetic field lines inside a bar magnet are not parallel.

    This is false in the usual textbook/JEE approximation.

    • Inside a uniformly magnetized bar magnet, field lines are drawn nearly parallel from south to north through the magnet.
    • The standard description treats them as approximately parallel inside.

    Hence, (D) is incorrect.

  5. Check statement (E):

    (E) says: χ=−1\chi = -1χ=−1 is the condition for a perfect diamagnetic material.

    This is correct.

    • For a perfect diamagnet (for example, ideal superconductor in magnetic response), magnetic susceptibility is χ=−1\chi = -1χ=−1
    • This corresponds to complete expulsion of magnetic field.

    Hence, (E) is correct.

  6. Collect correct statements

    Correct statements are: (B),(C),(E)\boxed{(B), (C), (E)}(B),(C),(E)​

  7. Match with given options

    Options provided are:

    • A: (A) and (B) only
    • B: (B) and (C) only
    • C: (C) and (E) only
    • D: (B) and (D) only

    Our derived correct set is (B),(C),(E)(B), (C), (E)(B),(C),(E), but this combination is not present in the options.

    Among the listed options, option C misses (B), so it is not fully correct.

  8. Conclusion

    The question appears to have an issue in the options or in statement interpretation. Using standard physics, the correct statements are: (B),(C),(E)\boxed{(B), (C), (E)}(B),(C),(E)​ Since that set is absent, the stored answer C does not agree with the physics-based derivation.

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