Electromagnetic Waves — Chapter Summary
Madhya Pradesh Board · Class 12 · Physics
Summary of Electromagnetic Waves for Madhya Pradesh Board Class 12 Physics. Part of the Madhya Pradesh Board Class 12 Physics syllabus.
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Overview
Electromagnetic waves are self-sustaining oscillations of electric and magnetic fields that travel through space. They arise from time-varying electric and magnetic fields and can propagate through vacuum without any material medium. Maxwell’s theory connected electricity, magnetism, and light into
Key Concepts
A changing electric field produces
A changing electric field produces an additional current term called displacement current. It is given by i_d = ε0 dΦ_E/dt. Inside a charging capacito
The corrected form of Ampere’s law
The corrected form of Ampere’s law includes both conduction current and displacement current: ∮ B · dl = μ0 i_c + μ0 ε0 (dΦ_E/dt).
Only accelerated charges radiate electromagnetic waves
Only accelerated charges radiate electromagnetic waves. Stationary charges and charges in uniform motion do not produce EM waves.
In a plane electromagnetic wave
In a plane electromagnetic wave, the electric field and magnetic field are mutually perpendicular and both are perpendicular to the direction of propa
In vacuum
In vacuum, the wave speed is c = 1/√(μ0ε0). In a medium, the speed is v = 1/√(με). Also, ω = ck and νλ = c.
Learning Objectives
- Understand why Maxwell introduced displacement current
- Explain the Ampere-Maxwell law and the role of changing electric flux
- Describe how electromagnetic waves are produced by accelerated charges
- State the basic nature of electromagnetic waves: transverse fields, same frequency, and speed in vacuum
- Use the relations between wavelength, frequency, speed, and field amplitudes
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