Electromagnetic Waves notes
OpenThe 4 formulas you need for Electromagnetic Waves, on one page.
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Electromagnetic Waves: One-Page Formula Sheet
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Last updated: 26 October 2026
Formula sheet
Electromagnetic Waves formulas
Electromagnetic Waves — formula sheet
Formulas
- c = 1/√(μ₀ε₀) = E₀/B₀
- Displacement current I_d = ε₀ dΦ_E/dt
- Intensity I = ½ε₀E₀²c
- Radiation pressure = I/c (absorbed)
Key ideas
- EM waves are transverse, with E and B perpendicular to each other and to the direction of travel
- They need no medium
- Energy is shared equally between electric and magnetic fields
- Order of the spectrum by wavelength: radio > micro > IR > visible > UV > X-ray > gamma
Traps to avoid
- Mixing up the order of the spectrum
- Forgetting the factor ½ in average intensity
- Using E₀ = B₀ without c
jeevisionary.in/jee-topics/physics/em-waves/
FAQs
Frequently asked questions
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Read it once a day for a week, then cover it and write the formulas from memory. Revise only the ones you missed.