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Formulae (1)
Electricity & Magnetism
Advanced
EM Energy Density
u
=
1
2
ε
0
E
2
+
B
2
2
μ
0
u = \tfrac{1}{2}\varepsilon_0 E^2 + \frac{B^2}{2\mu_0}
u
=
2
1
ε
0
E
2
+
2
μ
0
B
2
Energy stored per unit volume in EM fields.