Electromagnetic Waves — Revision Notes
Telangana Open School (TOSS) · Class 12 · Physics
Electromagnetic Waves revision notes for Telangana Open School (TOSS) Class 12 Physics: 3 topics in quick points.
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Key Topics to Revise
Displacement Current
- Displacement current is a concept introduced by Maxwell to correct Ampere's circuital law.
- It arises due to a time-varying electric field and is not a flow of actual charges.
- Displacement current ensures continuity of current in circuits with capacitors.
Nature of Electromagnetic Waves
- Electromagnetic waves are transverse waves with electric and magnetic fields perpendicular to each other and to the direction of propagation.
- They are self-sustaining — changing electric field generates magnetic field and vice versa.
- These waves travel in vacuum at speed \( c = 3 \times 10^8 \, \text{m/s} \), given by \( c = \frac{1}{\sqrt{\mu_0 \varepsilon_0}} \).
Electromagnetic Spectrum
- The EM spectrum classifies waves by frequency or wavelength, from radio waves to gamma rays.
- There is no sharp boundary between types; classification is based on source and detection method.
- All EM waves travel at same speed in vacuum but differ in frequency, wavelength, energy, and applications.
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