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Electromagnetic Waves

JEE Mains Physics. Try each one first, then open its answer.

Top 10 JEE Mains PYQs to practise first

The questions and kinds of question asked most often come first. Each one says how often and in which papers.

  1. Question 1

    This type asked 11 times: 2021 Paper 5, 2021 Paper 9, 2021 Paper 21, 14 Jun 2022, 25 Jul 2022, 26 Jul 2022, 10 Apr 2023, 11 Apr 2023, 29 Jan 2024, 23 Jan 2025, 2 Apr 2026 S2. This one: 2 Apr 2026 S2 See all 11 of this type

    12
    An electromagnetic wave travels in free space along the xx-direction. At a particular point in space and time, B→=2×10−7j^T\overrightarrow{B}= 2 \times10^{- 7}\widehat{j}T is associated with this wave. The value of corresponding electric field E→\overrightarrow{E} at this point is ____\_\_\_\_ V/m.

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  2. Question 2

    This type asked 10 times: 26 Jun 2022, 28 Jun 2022, 30 Jan 2024, 4 Apr 2024, 9 Apr 2024, 23 Jan 2025, 28 Jan 2025, 21 Jan 2026 S1, 28 Jan 2026 S2, 4 Apr 2026 S2. This one: 4 Apr 2026 S2 See all 10 of this type

    15
    A magnetic field vector in an electromagnetic wave is represented by, B→=B0sin⁡(2πvt−2πxλ)j^\overrightarrow{B}=B_{0}\sin\left( 2\pi vt-\frac{2\pi x}{\lambda} \right)\widehat{j}. Its associated electric field vector is ____\_\_\_\_ .

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  3. Question 3

    This type asked 5 times: 29 Jun 2022, 1 Feb 2024, 22 Jan 2025, 23 Jan 2025, 5 Apr 2026 S1. This one: 5 Apr 2026 S1 See all 5 of this type

    12
    A displacement current of 4.0 A can be set up in the space between two parallel plates of 6μ F6\mu\text{ }F capacitor. The rate of change of potential difference across the plates of the capacitor is nearly α×106 V/s\alpha \times10^{6}\text{ }V/s. The value of α\alpha is ____\_\_\_\_ .

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  4. Question 4

    This type asked 5 times: 25 Jun 2022, 31 Jan 2023, 6 Apr 2024, 4 Apr 2025, 23 Jan 2026 S2. This one: 23 Jan 2026 S2 See all 5 of this type

    18
    The ratio of speeds of electromagnetic waves in vacuum and a medium, having dielectric constant k=3k = 3 and permeability of μ=2μ0\mu = 2\mu_{0}, is ( μ0=\mu_{0}= permeability of vacuum)

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  5. Question 5

    This type asked 5 times: 25 Jan 2023, 13 Apr 2023, 29 Jan 2024, 30 Jan 2024, 23 Jan 2026 S1. This one: 23 Jan 2026 S1 See all 5 of this type

    3
    Match List-I with List-II.
    List-I (Relation)List-II (Law)
    (A) ∮E→⋅dl→=−ddt∮B→⋅da→\oint \overrightarrow{E} \cdot \overrightarrow{dl} = - \frac{d}{dt}\oint \overrightarrow{B} \cdot \overrightarrow{da}(I) Ampere's circuital law
    (B) ∮B→⋅dl→=μ0(I+ϵ0dϕEdt)\oint \overrightarrow{B} \cdot \overrightarrow{dl} = \mu_{0}\left( I + \epsilon_{0}\frac{d\phi_{E}}{dt} \right)(II) Faraday's laws of electromagnetic induction
    (C) ∮E→⋅da→=1ϵ0∫ρdv\oint \overrightarrow{E} \cdot \overrightarrow{da} = \frac{1}{\epsilon_{0}}\int\rho dv(III) Ampere-Maxwell law
    (D) ∮B→⋅dl→=μ0I\oint \overrightarrow{B} \cdot \overrightarrow{dl} = \mu_{0}I(IV) Gauss's law of electrostatics
    Choose the correct answer from the options given below :

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  6. Question 6

    This type asked 5 times: 28 Jul 2022, 30 Jan 2023, 27 Jan 2024, 8 Apr 2024, 3 Apr 2025. This one: 3 Apr 2025 See all 5 of this type

    4
    The radiation pressure exerted by a 450 W light source on a perfectly reflecting surface placed at 2 m away from it, is :

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  7. Question 7

    This type asked 4 times: 2021 Paper 19, 2021 Paper 23, 27 Jul 2022, 2 Apr 2026 S1. This one: 2 Apr 2026 S1 See all 4 of this type

    18
    An electromagnetic wave travelling in x -direction is described by field equation Ey=300sin⁡ω(t−xc)E_{y}= 300\sin\omega\left( t -\frac{x}{c} \right). If the electron is restricted to move in y -direction only with speed of 1.5×106 m/s1.5 \times10^{6}\text{ }m/s then ratio of maximum electric and magnetic forces acting on the electron is ____\_\_\_\_ .

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  8. Question 8

    This type asked 4 times: 2021 Paper 20, 2021 Paper 24, 22 Jan 2026 S1, 28 Jan 2026 S1. This one: 28 Jan 2026 S1 See all 4 of this type

    7
    The electric field of an electromagnetic wave travelling through a medium is given by E→(x,t)=25sin⁡(2.0×1015t−107x)n^\overrightarrow{E}(x,t) = 25\sin\left( 2.0 \times10^{15}t-10^{7}x \right)\widehat{n} then the refractive index of the medium is ____\_\_\_\_.(All given measurement are in SI units)

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  9. Question 9

    This type asked 4 times: 2021 Paper 2, 1 Feb 2023, 8 Apr 2023, 24 Jan 2026 S1. This one: 24 Jan 2026 S1 See all 4 of this type

    10
    Match the List-I with List-II
    List-IList-II
    (A) Radio-wave(I) is produced by Magnetron valve
    (B) Micro-wave(II) Due to change in the vibrational modes of atoms
    (C) Infrared-wave(III) Due to inner shell electrons moving from higher energy level to lower energy level
    (D) X-ray(IV) Due to rapid acceleration of electrons
    Choose the correct answer from the options given below:

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  10. Question 10

    This type asked 4 times: 25 Jun 2022, 27 Jan 2024, 6 Apr 2024, 23 Jan 2026 S1. This one: 23 Jan 2026 S1 See all 4 of this type

    22
    The equation of the electric field of an electromagnetic wave propagating through free space is given by: E=377sin⁡(6.27×103t−2.09×10−5x) N/CE = \sqrt{377}\sin\left( 6.27 \times 10^{3}t - 2.09 \times 10^{- 5}x \right)\ N/C. The average power of the electromagnetic wave is (1α)W/m2\left( \frac{1}{\alpha} \right)W/m^{2}. The value of α\alpha is ____\_\_\_\_ (Take μ0ε0=377\sqrt{\frac{\mu_{0}}{\varepsilon_{0}}} = 377 in SI units)