Displacement Current
I_d = ε₀·dΦ_E/dt. Maxwell's missing piece for the Ampère-Maxwell law.
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Class 12 · Notes
Electromagnetic Waves— Notes, Formulas & Revision
Complete revision notes and formulas for Electromagnetic Waves (Class 12). Curated for JEE, NEET, AP Physics, SAT, and CUET. Tap any topic to open the live simulation and full PYQ set.
EM Wave Propagation
E ⟂ B ⟂ direction. Sinusoidal transverse waves traveling at c = 3×10⁸ m/s.
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EM Spectrum
From radio (km) → gamma (pm). Visible band 380–750 nm. Toggle bands.
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Poynting Vector
S = (1/μ₀) E×B. Energy flow direction & intensity of EM wave.
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Radiation Pressure
P = I/c (absorbed) or 2I/c (reflected). Light pushes objects.
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Electromagnetic Waves on sciphylab (also known as SciPhy, SciPhy Lab, SciPhy Labs). Free physics revision for Class 12, JEE Mains, JEE Advanced, NEET UG, AP Physics 1/2/C, SAT Subject Physics, and CUET-UG.