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Friday, 9 October

NEET UG 2021 · Physics · Question 12

NEET 2021 Physics, question 12

Question 12 of the NEET 2021 paper (code O1) is a Physics question from Electromagnetic Waves. Its idea, Transverse Nature and E x B Direction, was asked 3 times, in 2018, 2021 and 2025, across NEET 2017–2026. The NTA final answer key gives option 4.

Updated 2026-10-08

Q12 · Physics

For a plane electromagnetic wave propagating in xx-direction, which one of the following combination gives the correct possible directions for electric field (E) and magnetic field (B) respectively ?

  1. 1j^+k^\hat{j}+\hat{k}, −j^−k^-\hat{j}-\hat{k}
  2. 2−j^+k^-\hat{j}+\hat{k}, −j^+k^-\hat{j}+\hat{k}
  3. 3j^+k^\hat{j}+\hat{k}, j^+k^\hat{j}+\hat{k}
  4. 4−j^+k^-\hat{j}+\hat{k}, −j^−k^-\hat{j}-\hat{k}Official answer

Official answer: option 4 · NTA final answer key

Same idea

Transverse Nature and E x B Direction, in other papers

NEET asked this idea 3 times, in 2018, 2021 and 2025. The other 2 questions below.

  • 2025 Q9The electric field in a plane electromagnetic wave is given by Ez=60cos⁡(5x+1.5×109t)E_z = 60\cos(5x + 1.5\times10^9 t) V/m. Then expression for the…One-line MCQ · Medium
  • 2018 Q18An em wave is propagating in a medium with a velocity V⃗=Vi^\vec{V} = V\hat{i}. The instantaneous oscillating electric field of this em wave…One-line MCQ · Easy

Transverse Nature and E x B Direction: every question and how it was framed

The chapter

Electromagnetic Waves in ten years of NEET

18 questions from 2017–2026, asked in 10 of 10 papers, about 1.7 a paper. Electromagnetic Waves alone had 18.

Chapter analysisStudy this chapterPractise this chapter

Electromagnetic Waves: questions per paper

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