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Friday, 9 October

JEE Main 2024 · PhysicsNumerical answerNumerical valueHardMulti-step

JEE Main 29 January 2024, Shift 1, Physics Q55

Question 55 of 90 in this shift, Physics question 25 of 30, Section B.

An electron is moving under the influence of the electric field of a uniformly charged infinite plane sheet S having surface charge density +σ+\sigma. The electron at tt=0 is at a distance of 1 m from S and has a speed of 1 m/s. The maximum value of σ\sigma if the electron strikes S at tt=1 s is α[mϵ0e]Cm2\alpha\left[\frac{m\epsilon_0}{e}\right]\frac{C}{m^2}, the value of α\alpha is ______.

Official answer

8

NTA final key.

Chapter
Electric Charges and Fields
Topic
Electric Field
Idea tested
Field of an Infinite Non-Conducting Sheet

Same idea in other shifts

Asked 2× in all
  1. 2 Apr 2025, Shift 1 · Q34A small bob of mass 100 mg and charge +10 μC+10\ \mu\mathrm{C} is connected to an insulating string of length 1 m. It is brought near to an…MediumSingle correctHas 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 42 of the 174 JEE Main shifts held from 2017 to 2026.