JEE PYQ: Magnetism And Matter Question 2
Question 2 - 2021 (18 Mar 2021 Shift 2)
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) $\chi = -1$ is the condition for a perfect diamagnetic material, where $\chi$ is its magnetic susceptibility. Choose the correct answer from the options given below:
(1) (C) and (E) only
(2) (B) and (D) only
(3) (A) and (B) only
(4) (B) and (C) only
Show Answer
Answer: (1) (C) and (E) only
Solution
Statement (C) is correct because the magnetic field outside the toroid is zero and they form closed loops inside the toroid itself. Statement (E) is correct because superconductors are perfect diamagnetic materials with $\mu_r = 1 + \chi$, $\chi = -1$, $\mu_r = 0$.
BETA
