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

5\pi \times 10^{-6}

C is moving with velocity of

\left(3\hat{i} + 2\hat{k}\right) \times 10^{-2}

m/s in a region having magnetic field

\vec{B} = 0.1\,\hat{k}

Wb/m

^2

. It moves a distance of

\alpha

meter along

\hat{k}

when it completes 5 revolutions. The value of

\alpha

is ________.

Official answer

NTA final key.

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

Same idea in other shifts

Asked 7× in all

4 Apr 2024, Shift 1 · Q42An electron is projected with uniform velocity along the axis inside a current carrying long solenoid. Then :EasySingle correct
6 Apr 2023, Shift 2 · Q57A proton with a kinetic energy of 2.0 eV moves into a region of uniform magnetic field of magnitude $\frac{\pi}{2}\times10^{-3}$ T. The…MediumNumerical value
8 Apr 2023, Shift 1 · Q48A charge particle moving in magnetic field B, has the components of velocity along B as well as perpendicular to B. The path of the charge…EasySingle correct
11 Apr 2023, Shift 2 · Q48An electron is allowed to move with constant velocity along the axis of current carrying straight solenoid. A. The electron will…MediumOther
2 Sep 2020, Shift 1 · Q13A beam of protons with speed $4\times10^{5}\ \mathrm{ms^{-1}}$ enters a uniform magnetic field of 0.3 T at an angle of $60^\circ$ to the…MediumSingle correct
2 Sep 2020, Shift 2 · Q12The figure shows a region of length ‘ $l$ ’ with a uniform magnetic field of 0.3 T in it and a proton entering the region with velocity…MediumDiagram basedHas a figure

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.