Poynting Vector & Radiation Pressure Calculator
Intensity, electric and magnetic field amplitudes and radiation pressure of an electromagnetic wave from an isotropic source.
How to use the Poynting Vector & Radiation Pressure Calculator
- Enter or select: Radiated power P, Distance r.
- The results (Intensity |S|, Electric field (RMS), Electric field amplitude E₀, Magnetic field amplitude B₀, Radiation pressure (absorbing), Radiation pressure (reflecting), Energy density) are calculated instantly as you type.
- Use “Copy link” to share the calculation with the same input values.
Formula
- S = E × H
- I = E₀²/(2η₀), η₀ = √(μ₀/ε₀) ≈ 376.73 Ω
- p = I/c (absorbed), 2I/c (reflected)