CBSE 12 Physics · U5
Electromagnetic Waves
CBSE Class 12 Physics Unit V: displacement current, qualitative origin and characteristics of electromagnetic waves, transverse nature of EM waves, and the electromagnetic spectrum with elementary uses.
Test yourself
A focused, distraction-free run through 25 multiple-choice questions. Hints if you need them; your score at the end.
Difficulty guide
The label describes the problem, not your ability.
1/5 - Foundational
Warm-up setup; checks one basic idea.
2/5 - Routine exam skill
Normal syllabus skill; usually one main rule or interpretation.
3/5 - Standard multi-step
Exam-style problem with multiple steps or a common trap.
4/5 - Hard exam skill
High-end exam problem; combines methods carefully.
5/5 - Challenge
Stretch problem beyond normal exam pressure.
Topic 5.1
Displacement Current
Need for displacement current, charging capacitor, and Maxwell's correction to Ampere's law.
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Topic 5.2
Origin and Speed of Electromagnetic Waves
Production by accelerated charges, no need for material medium, and speed in vacuum.
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Topic 5.3
Transverse Nature and Field Direction
Mutual perpendicularity of electric field, magnetic field, and direction of propagation.
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Topic 5.4
Electromagnetic Spectrum
Order of spectrum, wavelength-frequency relation, and identification of common bands.
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Topic 5.5
Uses of Electromagnetic Waves
Elementary uses of radio waves, microwaves, infrared, visible, ultraviolet, X-rays, and gamma rays.
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