NEET PhysicsNCERT Class 12Electromagnetic Waves

Electromagnetic Waves: NEET questions with solutions

NEET tests the displacement current ε₀ dΦ_E/dt, the relations B₀ = E₀/c and c = 1/√(μ₀ε₀), reading wavelength, frequency and direction from a wave equation, the mutual perpendicularity of E, B and travel, and the order of the spectrum with the source and use of each band. Marks are lost by mixing up neighbouring bands, by setting B₀ equal to E₀, and by forgetting that every em wave has the same speed in vacuum.

Revise first: NCERT notes for Electromagnetic Waves

Questions

10 questions · answers after you pick

1In a plane electromagnetic wave travelling in vacuum, the electric field oscillates with amplitude 120 V m⁻¹. What are the amplitude of the…Nature of electromagnetic wavesEasySingle correct 2Which sequence lists these radiations in order of increasing wavelength?The electromagnetic spectrumEasySingle correct 3While a parallel plate capacitor with plates of area 0.040 m² is being charged, the electric field between the plates increases at a rate of…Displacement currentMediumSingle correct 4The electric field of an em wave in vacuum is E_y = E₀ sin(kx − ωt), with ω = 6.0 × 10⁹ rad s⁻¹. What is its wavelength? (c = 3.0 × 10⁸ m…Speed in vacuum and in mediaMediumSingle correct 5A plane em wave travels in the +z direction. At a certain point and instant, its electric field points along +x. Along which direction does…Nature of electromagnetic wavesEasySingle correct 6Match each band of the electromagnetic spectrum in List I with a matching fact about it in List II.The electromagnetic spectrumMediumMatch the following 7Four claims are made about how electromagnetic waves are produced and how they travel. Which of them hold?Sources of electromagnetic wavesMediumStatement based 8A 100 MHz em wave passes from vacuum into a non-magnetic medium (μᵣ = 1) of relative permittivity εᵣ = 2.25. What is its wavelength in the…Speed in vacuum and in mediaHardSingle correct 9A parallel plate capacitor is being charged by a steady current. Read the Assertion (A) and Reason (R) and choose the correct option.The charging capacitor puzzleMediumAssertion–Reason 10The magnetic field of an em wave in vacuum is B_z = (4.0 × 10⁻⁸ T) sin(1000x + 3.0 × 10¹¹ t), with x in metres and t in seconds. In which…Nature of electromagnetic wavesHardSingle correct

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