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Saturday, 31 October

JEE Main 2021 · PhysicsMultiple choiceSingle correctMediumMulti-step

JEE Main 26 August 2021, Shift 2, Physics Q11

Question 11 of 90 in this shift, Physics question 11 of 30, Section A.

A light beam is described by E=800 sin⁡ω(t−xc)\mathrm{E}=800\,\sin\omega\left(\mathrm{t}-\frac{x}{\mathrm{c}}\right). An electron is allowed to move normal to the propagation of light beam with a speed of 3×107 ms−13\times10^{7}\ \mathrm{ms^{-1}}. What is the maximum magnetic force exerted on the electron ?
  1. (1)1.28×10−181.28\times10^{-18} N
  2. (2)12.8×10−1812.8\times10^{-18} NOfficial answer
  3. (3)12.8×10−1712.8\times10^{-17} N
  4. (4)1.28×10−211.28\times10^{-21} N

Official answer

Option 2

NTA final key.

Chapter
Electromagnetic Waves
Topic
No close match in our taxonomy
Idea tested
No close match in our taxonomy

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.