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Saturday, 31 October

JEE Main 2021 · PhysicsMultiple choiceSingle correctMediumConceptual

JEE Main 27 August 2021, Shift 1, Physics Q13

Question 13 of 90 in this shift, Physics question 13 of 30, Section A.

Two ions of masses 4 amu and 16 amu have charges +2+2e and +3+3e respectively. These ions pass through the region of constant perpendicular magnetic field. The kinetic energy of both ions is same. Then :
  1. (1)lighter ion will be deflected more than heavier ionOfficial answer
  2. (2)lighter ion will be deflected less than heavier ion
  3. (3)both ions will be deflected equally
  4. (4)no ion will be deflected

Official answer

Option 1

NTA final key.

Chapter
Moving Charges and Magnetism
Topic
Lorentz Force
Idea tested
Trajectory Radii Ratio for Same Kinetic Energy

Same idea in other shifts

Asked 4× in all
  1. 9 Apr 2024, Shift 2 · Q44A proton and a deutron (q=+eq=+e, m=2.0m=2.0u) having same kinetic energies enter a region of uniform magnetic field B⃗\vec{B}, moving…EasySingle correct
  2. 24 Jun 2022, Shift 2 · Q39A proton, a deuteron and an α\alpha-particle with same kinetic energy enter into a uniform magnetic field at right angle to magnetic…EasySingle correct
  3. 27 Jun 2022, Shift 2 · Q58A deuteron and a proton moving with equal kinetic energy enter into to a uniform magnetic field at right angle to the field. If rdr_d 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.