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Saturday, 31 October

JEE Main 2024 · PhysicsMultiple choiceSingle correctEasyConceptual

JEE Main 4 April 2024, Shift 1, Physics Q42

Question 42 of 90 in this shift, Physics question 12 of 30, Section A.

An electron is projected with uniform velocity along the axis inside a current carrying long solenoid. Then :
  1. (1)the electron will be accelerated along the axis.
  2. (2)the electron path will be circular about the axis.
  3. (3)the electron will experience a force at 45∘45^\circ to the axis and execute a helical path.
  4. (4)the electron will continue to move with uniform velocity along the axis of the solenoid.Official answer

Official answer

Option 4

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
  1. 8 Apr 2026, Shift 2 · Q48A 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}…MediumNumerical value
  2. 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 π2×10−3\frac{\pi}{2}\times10^{-3} T. The…MediumNumerical value
  3. 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
  4. 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
  5. 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
  6. 2 Sep 2020, Shift 2 · Q12The figure shows a region of length ‘ll’ 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.