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Saturday, 31 October

JEE Main 2023 · PhysicsMultiple choiceSingle correctMediumCalculation

JEE Main 13 April 2023, Shift 1, Physics Q49

Question 49 of 90 in this shift, Physics question 19 of 30, Section A.

Two charges each of magnitude 0.01 C and separated by a distance of 0⋅40{\cdot}4 mm constitute an electric dipole. If the dipole is placed in an uniform electric field 'E⃗\vec{E}' of 10 dyne/C making 30∘30^\circ angle with E⃗\vec{E}, the magnitude of torque acting on dipole is:
  1. (1)1⋅0×10−81{\cdot}0 \times 10^{-8} Nm
  2. (2)2⋅0×10−102{\cdot}0 \times 10^{-10} NmOfficial answer
  3. (3)4⋅0×10−104{\cdot}0 \times 10^{-10} Nm
  4. (4)1⋅5×10−91{\cdot}5 \times 10^{-9} Nm

Official answer

Option 2

NTA final key.

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

Same idea in other shifts

Asked 4× 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
  3. 2 Apr 2017 (offline) · Q14An 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…MediumSingle correct

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.