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Friday, 9 October

NEET UG 2025 · Physics · Question 9

NEET 2025 Physics, question 9

Question 9 of the NEET 2025 paper (code 45) 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 1.

Updated 2026-10-08

Q9 · Physics

The 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 corresponding magnetic field is (here subscripts denote the direction of the field) :

  1. 1By=2×10−7cos⁡(5x+1.5×109t)B_y = 2\times10^{-7}\cos(5x + 1.5\times10^9 t) TOfficial answer
  2. 2Bx=2×10−7cos⁡(5x+1.5×109t)B_x = 2\times10^{-7}\cos(5x + 1.5\times10^9 t) T
  3. 3Bz=60cos⁡(5x+1.5×109t)B_z = 60\cos(5x + 1.5\times10^9 t) T
  4. 4By=60sin⁡(5x+1.5×109t)B_y = 60\sin(5x + 1.5\times10^9 t) T

Official answer: option 1 · 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.

  • 2021 Q12For a plane electromagnetic wave propagating in xx-direction, which one of the following combination gives the correct possible…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

0241’171’182’192’202’212’222’232’242’252’26