# Electric and Magnetic Fields

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A magnetic field has a magnitude of 12 T. What is the magnitude of an electric field that stores the same energy per unit volume as this magnetic field?

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#### Solution Preview

From the treatment of Electric and Magnetic fields, we can arrive at the following generic results :

Energy density (energy per unit volume) for magnetic ...

#### Solution Summary

Energy density (energy per unit volume) for magnetic field, n_b = 1/2 * B^2/u. Energy density (energy per unit volume) for electric field, n_e = 1/2 * eps*E^2. See solution for full calculations and answer.

$2.49