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JEE Main · 2021 · 18 Mar 2021 · Shift 2 · Magnetic Properties of Matter

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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 can not be completely straight and confined
(C) Magnetic field lines are completely confined within a toroid.
(D) Magnetic field lines inside bar magnet are not parallel.
(E) is the condition for a perfect diamagnetic material, where is its magnetic susceptibility.
Choose the correct answer from the options given below :
  1. (A)(C) and (E) only✓ Correct
  2. (B)(A) and (B) only
  3. (C)(B) and (D) only
  4. (D)(B) and (C) only

Answer: (A)

Solution

Statement (A) is false: magnetic monopoles do not exist. Statement (B) is true: field lines outside a solenoid spread out and cannot be perfectly straight. Statement (C) is true: in an ideal toroid, all field lines are confined within. Statement (D) is false: inside a bar magnet, field lines run from south to north and are approximately parallel. Statement (E) is true: for a perfect diamagnet (superconductor), . Thus (C) and (E) are correct, giving option (A).

JEE Main · 2021 · 18 Mar 2021 · Shift 2 · Single correct option

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