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Friday, 9 October

JEE Main 2017 · PhysicsMultiple choiceSingle correctMediumApplication

JEE Main 2 April 2017 (offline), Physics Q14

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

An electric dipole has a fixed dipole moment p⃗\vec{p}, which makes angle θ\theta with respect to xx-axis. When subjected to an electric field E⃗1=Ei^\vec{E}_1 = E\hat{i}, it experiences a torque T⃗1=τk^\vec{T}_1 = \tau\hat{k}. When subjected to another electric field E⃗2=3E1j^\vec{E}_2 = \sqrt{3}E_1\hat{j} it experiences a torque T⃗2=−T⃗1\vec{T}_2 = -\vec{T}_1. The angle θ\theta is :
  1. (1)30∘30^\circ
  2. (2)45∘45^\circ
  3. (3)60∘60^\circOfficial answer
  4. (4)90∘90^\circ

Official answer

Option 3

CBSE answer key (25/04/2017, used for result).

Chapter
Electrostatic Potential and Capacitance
Topic
Electric Dipoles
Idea tested
Torque in Uniform Field

Same idea in other shifts

Asked 3× in all
  1. 7 Apr 2025, Shift 2 · Q37A dipole with two electric charges of 2 μ2\ \muC magnitude each, with separation distance 0.5 μ0.5\ \mum, is placed between the plates of a…MediumSingle correct
  2. 28 Jul 2022, Shift 1 · Q56Two electric dipoles of dipole moments 1.2×10−301.2\times10^{-30} Cm and 2.4×10−302.4\times10^{-30} Cm are placed in two different uniform electric…EasyNumerical value

Question text from the official JEE Main paper published by NTA (CBSE ran the 2017 exam); 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.