Frequently Asked Questions
What is energy density of a field?
Energy per unit volume stored in an electric or magnetic field: u = ½ε₀E² + B²/(2μ₀), in J/m³.
Are the electric and magnetic contributions independent?
Yes - you add them. In an electromagnetic wave they're equal at any instant, so the total is twice either part.
Why does magnetism dominate at high B?
Because B² is divided by the very small μ₀, the magnetic contribution scales steeply. Strong magnets store enormous energy per cubic meter.
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