JEE Main 2025 · 7 Apr · Shift 2 · Properties of EM Waves
The unit of is :
(I = intensity of an electromagnetic wave, c = speed of light)
- (A)
Vm
- (B)
NC-1
- (C)
NC
- (D)
Nm
Answer: (B)
Step-by-step solutionElectromagnetic Waves has 101 questions in JEE Main papers from 2020 to 2025, about 17 per year across all shifts. The most asked topic is Properties of EM Waves (84 questions), followed by Displacement Current (7) and EM Spectrum (6).
Updated
| Year | Questions | |
|---|---|---|
| 2025 | 12 | |
| 2024 | 17 | |
| 2023 | 19 | |
| 2022 | 18 | |
| 2021 | 23 | |
| 2020 | 12 |
| Topic | Questions | Share of chapter | Last asked |
|---|---|---|---|
| Properties of EM Waves | 84 | 83% | 2025 |
| Displacement Current | 7 | 7% | 2025 |
| EM Spectrum | 6 | 6% | 2024 |
| Electromagnetic Spectrum | 2 | 2% | 2023 |
| Maxwell's Equations | 2 | 2% | 2023 |
JEE Main 2025 · 7 Apr · Shift 2 · Properties of EM Waves
The unit of is :
(I = intensity of an electromagnetic wave, c = speed of light)
Vm
NC-1
NC
Nm
Answer: (B)
Step-by-step solutionJEE Main 2025 · 7 Apr · Shift 1 · Displacement Current
If denotes the permittivity of free space and is the flux of the electric field through the area bounded by the closed surface, then dimensions of are that of :
Answer: (C)
Step-by-step solutionJEE Main 2024 · 4 Apr · Shift 2 · EM Spectrum
Arrange the following in the ascending order of wavelength:
A. Gamma rays
B. - rays
C. Infrared waves
D. Microwaves
Choose the most appropriate answer from the options given below
Answer: (A)
Step-by-step solutionJEE Main 2023 · 13 Apr · Shift 1 · Maxwell's Equations
Which of the following Maxwell's equation is valid for time varying conditions but not valid for static conditions :
Answer: (C)
Step-by-step solutionJEE Main 2023 · 12 Apr · Shift 1 · Electromagnetic Spectrum
Given below are two statements: one is labelled as Assertion and the other is labelled as Reason
Assertion A : EM waves used for optical communication have longer wavelengths than that of microwave, employed in Radar technology.
Reason R : Infrared EM waves are more energetic than microwaves, (used in Radar)
In the light of given statements, choose the correct answer from the options given below.
Answer: (D)
Step-by-step solutionAll 101 questions are in the free PDF above, grouped by topic.
101 questions from 2020 to 2025, about 17 per year. In 2025 it had 12.
By past papers: Properties of EM Waves (83%), Displacement Current (7%) and EM Spectrum (6%) of all Electromagnetic Waves questions.
Yes. The PDF, the answer key and every step-by-step solution on PrepWiser are free, with no login needed to practise.
JEE Main PYQs by year: 2025 · 2024 · 2023 · 2022 · 2021 · 2020
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