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Saturday, 31 October

JEE Main 2024 · PhysicsMultiple choiceOtherMediumConceptual

JEE Main 27 January 2024, Shift 1, Physics Q42

Question 42 of 90 in this shift, Physics question 12 of 30, Section A.

A proton moving with a constant velocity passes through a region of space without any change in its velocity. If E⃗\vec{E} and B⃗\vec{B} represent the electric and magnetic fields respectively, then the region of space may have : (A) E=0, B=0E = 0,\ B = 0 (B) E=0, B≠0E = 0,\ B \neq 0 (C) E≠0, B=0E \neq 0,\ B = 0 (D) E≠0, B≠0E \neq 0,\ B \neq 0 Choose the most appropriate answer from the options given below :
  1. (1)(A), (B) and (C) only
  2. (2)(A), (C) and (D) only
  3. (3)(A), (B) and (D) onlyOfficial answer
  4. (4)(B), (C) and (D) only

Official answer

Option 3

NTA final key.

Chapter
Moving Charges and Magnetism
Topic
Lorentz Force
Idea tested
Velocity Selector and Crossed Fields

Same idea in other shifts

Asked 4× in all
  1. 8 Apr 2024, Shift 1 · Q57An electron with kinetic energy 5 eV enters a region of uniform magnetic field of 3 μ\muT perpendicular to its direction. An electric…MediumNumerical value
  2. 26 Jul 2022, Shift 2 · Q47A velocity selector consists of electric field E⃗=Ek^\vec{E} = E\hat{k} and magnetic field B⃗=Bj^\vec{B} = B\hat{j} with B=12 mTB = 12\ mT. The value…MediumSingle correct
  3. 4 Aug 2021, Shift 1 · Q28A potential difference of 800 V is applied across the plates of a parallel plate capacitor. The separation between the plates is 5 mm and…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.