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#light theory

2 public questions tagged with this topic.

Displacement Current and Ampere-Maxwell Law

What conclusion did Maxwell reach when the speed of electromagnetic waves matched the speed of light?

**Displacement current** I_d = ε₀ dΦ_E/dt, Φ_E = ∫ E·dA electric flux (V·m), ε₀=8.85×10⁻¹² F/m, ensures continuity of current in charging capacitor where conduction current stops between plates, I_d equals conduction current in wires, 3 A conduction ⇒ 3 A displacement, maintaining Ampere's law ∮ B·dl = μ₀(I_c+I_d). The document mentions that Maxwell concluded that light is an electromagnetic wave, as their speeds were nearly identical ( 3 × 10⁸ m/s ). Using c = fλ, E₀/B₀ = c, I_d = ε₀ dΦ_E/dt, and spectrum classification λ = c/f, evaluation yields Light is an electromagnetic wave, illustrating

Ref: NCERT > Physics Book > Electromagnetic Waves > Displacement Current and Ampere-Maxwell Law

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Applications of EM Waves in Communication and Medicine

What did Maxwell's unification of electricity, magnetism, and light lead to?

**X-rays and gamma rays in medicine** X-rays imaging because bone absorbs more than tissue, contrast, CT scan uses multiple X-ray projections, gamma knife uses focused gamma rays to destroy tumor with minimal surrounding damage, illustrating high-energy EM wave medical use. The document notes that Maxwell's work unified electricity, magnetism, and light, leading to the understanding that light is an electromagnetic wave and paving the way for technologies like radio communication. Using c = fλ, E₀/B₀ = c, I_d = ε₀ dΦ_E/dt, and spectrum classification λ = c/f, evaluation yields Understanding li

Ref: NCERT > Physics Book > Electromagnetic Waves > Applications of EM Waves in Communication and Medicine

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