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Friday, 9 October

JEE Main 2020 · PhysicsMultiple choiceSingle correctHardMulti-step

JEE Main 6 September 2020, Shift 2, Physics Q3

Question 3 of 75 in this shift, Physics question 3 of 25.

A particle moving in the xyxy plane experiences a velocity dependent force F⃗=k(vyi^+vxj^)\vec{F} = k\left(v_y\hat{i} + v_x\hat{j}\right), where vxv_x and vyv_y are the xx and yy components of its velocity v⃗\vec{v}. If a⃗\vec{a} is the acceleration of the particle, then which of the following statements is true for the particle ?
  1. (1)F⃗\vec{F} arises due to a magnetic field
  2. (2)quantity v⃗⋅a⃗\vec{v}\cdot\vec{a} is constant in time
  3. (3)kinetic energy of particle is constant in time
  4. (4)quantity v⃗×a⃗\vec{v}\times\vec{a} is constant in timeOfficial answer

Official answer

Option 4

NTA final key (Sep 2020).

Chapter
Work, Energy and Power
Topic
No close match in our taxonomy
Idea tested
No close match in our taxonomy

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 42 of the 174 JEE Main shifts held from 2017 to 2026.