Calculate the energy stored per unit volume in electric and magnetic fields.
Field Strengths
Energy Density Results
Electric Energy Density (uE)-J/m³
Magnetic Energy Density (uB)-J/m³
About this calculator
Quick Reference
EElectric Field Intensity
BMagnetic Flux Density
ε₀Permittivity of free space
μ₀Permeability of free space
Overview
Electric and magnetic fields are not just mathematical tools; they store actual physical energy. This calculator finds how much energy is packed into a cubic meter of space containing these fields.
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Pro Tips
Electric Density Formula: uE = ½ * ε₀ * E².
Magnetic Density Formula: uB = B² / (2 * μ₀).
ε₀ (Permittivity) ≈ 8.854 × 10⁻¹² F/m.
μ₀ (Permeability) = 4π × 10⁻⁷ T·m/A.
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Fun Facts
"In an electromagnetic wave (like light), the energy is shared equally between the electric and magnetic fields."
"Very strong magnetic fields, like those found in MRI machines, store significant amounts of energy."
"Energy density has units of Joules per cubic meter (J/m³), which is the same as pressure (Pascals)."
