Calculate the energy stored in a toroidal coil.(adsbygoogle = window.adsbygoogle || []).push({});

The magnetic field in a toroid is give by: [itex]B = \frac{\mu_0 n I}{2\pi r}[/itex]

Energy stored is given by:

[tex]W = {1\over 2\mu_0}\int B^2 d\tau[/tex]

[tex]W = {1\over 2\mu_0} \frac{\mu_0^2 n^2 I^2}{4\pi^2}\int {1\over r^2}d\tau[/tex]

How do I determine the volume element for atoroid?

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# Energy stored in a toroid

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