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Saturday, 31 October

JEE Main 2021 · PhysicsMultiple choiceOtherMediumConceptual

JEE Main 18 March 2021, Shift 2, Physics Q14

Question 14 of 90 in this shift, Physics question 14 of 30, Section A.

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\chi=-1 is the condition for a perfect diamagnetic material, where χ\chi is its magnetic susceptibility. Choose the correct answer from the options given below :
  1. (1)(B) and (D) only
  2. (2)(B) and (C) only
  3. (3)(A) and (B) only
  4. (4)(C) and (E) onlyOfficial answer

Official answer

Option 4

NTA final key.

Chapter
Magnetism and Matter
Topic
Ampere's Circuital Law
Idea tested
Toroidal Magnetic Field

Same topic in other shifts

All Ampere's Circuital Law questions
  1. 4 Apr 2026, Shift 2 · Q39A solenoid has a core made of material with relative permeability 400. The magnetic field produced in the interior of solenoid is 1.0 T.…EasySingle correct
  2. 5 Apr 2024, Shift 1 · Q43In a co-axial straight cable, the central conductor and the outer conductor carry equal currents in opposite directions. The magnetic…EasySingle correct
  3. 5 Apr 2024, Shift 2 · Q57A solenoid of length 0.5 m has a radius of 1 cm and is made up of 'm' number of turns. It carries a current of 5 A. If the magnitude of…EasyNumerical value
  4. 8 Apr 2024, Shift 2 · Q42A long straight wire of radius a carries a steady current I. The current is uniformly distributed across its cross section. The ratio of…MediumSingle correct
  5. 6 Apr 2023, Shift 1 · Q40A long straight wire of circular cross-section (radius a) is carrying steady current I. The current I is uniformly distributed across this…EasySingle correct
  6. 8 Apr 2023, Shift 1 · Q58The magnetic intensity at the center of a long current carrying solenoid is found to be 1.6×103 Am−11.6\times10^3\ \mathrm{Am^{-1}}. If the number…EasyNumerical value

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.