Learn

Saturday, 31 October

JEE Main 2024 · PhysicsNumerical answerNumerical valueHardCalculation

JEE Main 4 April 2024, Shift 1, Physics Q57

Question 57 of 90 in this shift, Physics question 27 of 30, Section B.

The magnetic field existing in a region is given by B⃗=0.2 (1+2x)k^ T\vec{B} = 0.2\,(1 + 2x)\hat{k}\,\mathrm{T}. A square loop of edge 50 cm carrying 0.5 A current is placed in xx-yy plane with its edges parallel to the xx-yy axes, as shown in figure. The magnitude of the net magnetic force experienced by the loop is ________ mN.

The figure, in words

x-y axes with origin (0, 0); dashed lines at x = 2 m and y = 2 m. A small square loop has its lower-left corner at (2 m, 2 m); current arrows: left side pointing down, bottom side pointing right, right side pointing up, top side pointing left (anticlockwise).

Official answer

50

NTA final key.

Chapter
Moving Charges and Magnetism
Topic
Magnetic Dipole Moment
Idea tested
Force in non-uniform magnetic fields

Same topic in other shifts

All Magnetic Dipole Moment questions
  1. 4 Apr 2026, Shift 1 · Q41An insulated wire is wound so that it forms a flat coil with N=200N=200 turns. The radius of the innermost turn is r1=3r_1=3 cm, and of the…MediumSingle correct
  2. 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
  3. 4 Apr 2026, Shift 2 · Q49A circular coil of radius 2 cm and 125 turns carries a current of 1 A. The coil is placed in a uniform magnetic field of magnitude 0.4 T.…EasyNumerical value
  4. 8 Apr 2026, Shift 2 · Q39A current carrying circular loop of radius 2 cm with unit normal n^=k^+i^2\hat{n} = \frac{\hat{k} + \hat{i}}{\sqrt{2}} is placed in a magnetic…MediumSingle correct
  5. 3 Apr 2025, Shift 2 · Q36A magnetic dipole experiences a torque of 80380\sqrt{3} N m when placed in uniform magnetic field in such a way that dipole moment makes…EasySingle correct
  6. 4 Apr 2024, Shift 2 · Q43The magnetic moment of a bar magnet is 0.5 Am2^2. It is suspended in a uniform magnetic field of 8×10−28\times10^{-2}T. The work done in…EasySingle 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. 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.