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Saturday, 31 October

JEE Main 2022 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 25 June 2022, Shift 1, Physics Q42

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

The electric field in an electromagnetic wave is given by E=56.5sin⁡ω(t−x/c) NC−1E=56.5\sin\omega(t-x/c)\ \mathrm{NC^{-1}}. Find the intensity of the wave if it is propagating along xx-axis in the free space. (Given ϵ0=8.85×10−12C2N−1m−2\epsilon_0=8.85\times10^{-12}\mathrm{C^2N^{-1}m^{-2}})
  1. (1)5.65 Wm−25.65\ \mathrm{Wm^{-2}}
  2. (2)4.24 Wm−24.24\ \mathrm{Wm^{-2}}Official answer
  3. (3)1.9×10−7 Wm−21.9\times10^{-7}\ \mathrm{Wm^{-2}}
  4. (4)56.5 Wm−256.5\ \mathrm{Wm^{-2}}

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.