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 = - 1 is the condition for a perfect diamagnetic material, where χ is its magnetic susceptibility. Choose the correct answer from the options given below: (a) (A) and (B) only (b) (B) and (C) only (c) (C) and (E) only (d) (B) and (D) only

Answer: (c). (A) Wrong: electric monopoles (single charges) exist; magnetic monopoles do not. (B) Field lines spread out at the ends of a finite solenoid, so they are not straight and confined there. (C) Correct: in an ideal toroid all field lines stay inside the core. (D) Wrong: inside a bar magnet the lines are nearly parallel (S to N). (E) Correct: perfect diamagnet (superconductor) has χ = -1, so μr = 0 and B = 0 inside. So the answer is (c) (C) and (E) only.

Which of the following statements are correct? (A) Electric monopoles… | JEE Main 2021 (18 Mar, Shift 2)

Q7JEE Main 2021 · 18 MAR · SHIFT 2Medium

Bar Magnet & Magnetic Moment

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.

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

(E) $\chi = -$ 1 is the condition for a perfect diamagnetic material, where $\chi$ is its magnetic susceptibility. Choose the correct answer from the options given below:

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Answer: (c)

(A) Wrong: electric monopoles (single charges) exist; magnetic monopoles do not.
(B) Field lines spread out at the ends of a finite solenoid, so they are not straight and confined there.
(C) Correct: in an ideal toroid all field lines stay inside the core.
(D) Wrong: inside a bar magnet the lines are nearly parallel (S to N).
(E) Correct: perfect diamagnet (superconductor) has $\chi = -1$ , so $\mu_r = 0$ and $B = 0$ inside.
So the answer is (c) (C) and (E) only.

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Bar Magnet & Magnetic Moment question from JEE Main 2021 (18 Mar, Shift 2)

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