Discussion
The energy density in a magnetic field is
Answer: D
It may equally be written as \( \tfrac{1}{2}\mathbf{B} \cdot \mathbf{H} \), and integrating it over all space gives the same total as the inductance expression. At one tesla in iron the density is of order four hundred kilojoules per cubic metre, far more than any electrostatic field achieves.
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