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Saturday, 31 October

JEE Main 2022 · PhysicsMultiple choiceSingle correctEasyApplication

JEE Main 28 July 2022, Shift 2, Physics Q12

Question 12 of 90 in this shift, Physics question 12 of 30, Section A.

A triangular shaped wire carrying 10 A current is placed in a uniform magnetic field of 0.5 T, as shown in figure. The magnetic force on segment CD is (Given BC = CD = BD = 5 cm.)

The figure, in words

Wire runs A to B along a horizontal line, then up from B to C, down from C to D (equilateral triangle BCD, each side 5 cm), then D to E along the horizontal line; current direction arrows along the wire; uniform magnetic field drawn as rightward arrows (labelled 'Magnetic field') parallel to AB.
  1. (1)0.126 N
  2. (2)0.312 N
  3. (3)0.216 NOfficial answer
  4. (4)0.245 N

Official answer

Option 3

NTA final key.

Chapter
Moving Charges and Magnetism
Topic
Lorentz Force
Idea tested
Magnetic Force Vector Calculation

Same idea in other shifts

Asked 7× in all
  1. 2 Apr 2026, Shift 1 · Q481 μ1\ \muC charge moving with velocity v⃗=(i^−2j^+3k^)\vec v=\left(\hat i-2\hat j+3\hat k\right) m/s in the region of magnetic field…EasyNumerical value
  2. 5 Apr 2026, Shift 1 · Q49The charged particle moving in a uniform magnetic field of (3i^+2j^) T(3\hat{i} + 2\hat{j})\,\mathrm{T} has an acceleration…MediumNumerical value
  3. 26 Jul 2022, Shift 1 · Q38A charge particle is moving in a uniform magnetic field (2i^+3j^)\left(2\hat{i} + 3\hat{j}\right) T. If it has an acceleration of…EasySingle correct
  4. 25 Feb 2021, Shift 1 · Q15A proton, a deuteron and an α\alpha particle are moving with same momentum in a uniform magnetic field. The ratio of magnetic forces…MediumSingle correct
  5. 8 Jan 2020, Shift 1 · Q12Proton with kinetic energy of 1 MeV moves from south to north. It gets an acceleration of 101210^{12} m/s2^2 by an applied magnetic field…MediumSingle correct
  6. 3 Sep 2020, Shift 1 · Q2A charged particle carrying charge 1 μ\muC is moving with velocity (2i^+3j^+4k^)(2\hat{i} + 3\hat{j} + 4\hat{k}) ms−1^{-1}. If an external magnetic…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.