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Friday, 9 October

JEE Main 2021 · PhysicsMultiple choiceSingle correctMediumApplication

JEE Main 18 March 2021, Shift 1, Physics Q19

Question 19 of 90 in this shift, Physics question 19 of 30, Section A.

A plane electromagnetic wave of frequency 100 MHz is travelling in vacuum along the xx-direction. At a particular point in space and time, B⃗=2.0×10−8 k^\vec{B} = 2.0\times10^{-8}\,\hat{k} T. (where, k^\hat{k} is unit vector along zz-direction) What is E⃗\vec{E} at this point ? (speed of light c=3×108c = 3\times10^{8} m/s)
  1. (1)0.6 j^0.6\,\hat{j} V/m
  2. (2)6.0 j^6.0\,\hat{j} V/mOfficial answer
  3. (3)6.0 k^6.0\,\hat{k} V/m
  4. (4)0.6 k^0.6\,\hat{k} V/m

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 42 of the 174 JEE Main shifts held from 2017 to 2026.