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#electrodynamics

2 public questions tagged with this topic.

Production of EM Waves and Hertz Experiment

What type of motion of charges produces electromagnetic waves?

**Hertz experiment** used induction coil connected to two rods with gap, spark produced oscillating charge, emitted EM wave, received by loop with gap sparking when E induced, measured wavelength by standing wave, demonstrated EM wave properties, validating Maxwell. The document states that accelerated charges, such as those in oscillatory motion, produce electromagnetic waves, while stationary or uniformly moving charges do not. Using c = fλ, E₀/B₀ = c, I_d = ε₀ dΦ_E/dt, and spectrum classification λ = c/f, evaluation yields Accelerated motion, illustrating EM wave transverse nature and Maxwe

Ref: NCERT > Physics Book > Electromagnetic Waves > Production of EM Waves and Hertz Experiment

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Electromagnetic Spectrum - Radio Waves and Microwaves

In electromagnetic theory, what distinguishes the production mechanism of radio waves from that of visible light?

**Radio waves** λ≈10⁻¹ to 10⁴ m, f≈10⁴ to 10⁹ Hz, produced by rapid acceleration/deceleration of electrons in aerials/antenna, used for long-distance communication because low frequency diffracts around obstacles and reflects from ionosphere, enabling ground wave and sky wave propagation, effective for broadcasting. Radio waves are typically produced by oscillating currents in macroscopic circuits (like antennas), while visible light arises from electron transitions between energy levels within atoms. Using c = fλ, E₀/B₀ = c, I_d = ε₀ dΦ_E/dt, and spectrum classification λ = c/f, evaluation yi

Ref: NCERT > Physics Book > Electromagnetic Waves > Electromagnetic Spectrum - Radio Waves and Microwaves

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