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Saturday, 31 October

JEE Main 2021 · PhysicsNumerical answerNumerical valueMediumMulti-step

JEE Main 26 August 2021, Shift 1, Physics Q25

Question 25 of 90 in this shift, Physics question 25 of 30, Section B.

Two short magnetic dipoles m1m_1 and m2m_2 each having magnetic moment of 1 Am2\mathrm{Am^2} are placed at point O and P respectively. The distance between OP is 1 meter. The torque experienced by the magnetic dipole m2m_2 due to the presence of m1m_1 is __________ ×10−7\times10^{-7} Nm.

The figure, in words

Two arrows: m1 at point O drawn as a vertical arrow pointing up; m2 at point P (to the right of O) drawn as a horizontal arrow pointing right.

Official answer

1

NTA final key.

Chapter
Magnetism and Matter
Topic
Magnetic Dipole Moment
Idea tested
Magnetic Field of a Short Dipole

Same idea in other shifts

Asked 3× in all
  1. 4 Apr 2026, Shift 2 · Q48Two identical small bar magnets each of dipole moment 353\sqrt5 J/T are placed at a center to center separation of 10 cm, with their axes…MediumNumerical valueHas a figure
  2. 29 Jan 2024, Shift 1 · Q57The magnetic potential due to a magnetic dipole at a point on its axis situated at a distance of 20 cm from its center is…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. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.