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Friday, 9 October

JEE Main 2026 · PhysicsNumerical answerNumerical valueMediumMulti-step

JEE Main 8 April 2026, Shift 2, Physics Q48

Question 48 of 75 in this shift, Physics question 23 of 25, Section B.

A 5 mg particle carrying a charge of 5π×10−65\pi \times 10^{-6} C is moving with velocity of (3i^+2k^)×10−2\left(3\hat{i} + 2\hat{k}\right) \times 10^{-2} m/s in a region having magnetic field B⃗=0.1 k^\vec{B} = 0.1\,\hat{k} Wb/m2^2. It moves a distance of α\alpha meter along k^\hat{k} when it completes 5 revolutions. The value of α\alpha is ________.

Official answer

2

NTA final key.

Chapter
Moving Charges and Magnetism
Topic
Lorentz Force
Idea tested
Helical Motion and Pitch

Same idea in other shifts

Asked 2× in all
  1. 2 Sep 2020, Shift 1 · Q13A beam of protons with speed 4×105 ms−14\times10^{5}\ \mathrm{ms^{-1}} enters a uniform magnetic field of 0.3 T at an angle of 60∘60^\circ to the…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 42 of the 174 JEE Main shifts held from 2017 to 2026.