Class 12 · Chapter 8
Electromagnetic Waves
Overview, notes, short notes, formula sheet, daily practice problems, previous year questions, and videos for this chapter — all in one place.
Electromagnetic Waves Practice Questions
18 questions on Electromagnetic Waves. Try each one before checking the answer.
If E and B are the electric and magnetic field vectors of an electromagnetic wave, the direction of propagation of the wave is along:
Electromagnetic waves do NOT transport:
An electromagnetic wave is described by E = 5×10⁻⁴ sin(π×10⁷x − 3π×10¹⁵t) (SI units). What is the speed of this wave?
For the same wave, E = 5×10⁻⁴ sin(π×10⁷x − 3π×10¹⁵t), what is its wavelength?
Which of Maxwell's four equations directly expresses the fact that an isolated magnetic monopole does not exist?
The electric field between the plates of a parallel-plate capacitor (plate area 0.02 m²) changes at a rate of 1 × 10¹² V/(m·s). What is the displacement current between the plates?
A parallel-plate capacitor has circular plates of radius 10 cm separated by 4 mm, and is being charged by a constant current of 0.2 A. What is the displacement current between the plates?
In an electromagnetic wave, the electric field has amplitude 90 V/m. What is the amplitude of the magnetic field?
A plane electromagnetic wave has an electric field amplitude of 100 V/m. What is its average intensity?
A plane electromagnetic wave has an electric field amplitude of 60 V/m. What is the total average energy density of the wave?
An electromagnetic wave of intensity 600 W/m² is incident on a surface. What is the radiation pressure if the surface is (a) perfectly absorbing and (b) perfectly reflecting?
A point source radiates electromagnetic waves uniformly in all directions with an average power output of 1000 W. What is the amplitude of the electric field at a distance of 5 m from the source?
A radio receiver is tuned to a wavelength of 600 m using an inductor of 2 mH. What capacitance is required in the tuning circuit?
Which part of the electromagnetic spectrum is mainly used in radar and satellite communication?
Which layer of Earth's atmosphere absorbs most of the Sun's ultraviolet radiation, protecting living organisms?
The greenhouse effect, which keeps Earth's surface warm, is primarily caused by the trapping of:
Arrange the following in order of increasing frequency: visible light, X-rays, microwaves, gamma rays.
The speed of electromagnetic waves in vacuum is given by:
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