Consider an ideal stationary magnetic dipole m in a static electric field E. Show that the fields carry momentum

So far, this is valid for any localized static configuration. For a current confined to an infinitesimal neighborhood of the origin we can approximate V(r) ≈ V(0) − E(0) · r. Treat the dipole as a current loop, and use Eqs. 5.82 and 1.108.

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p = -4oμo(m x E).