Abstract
A variational principle is formulated which yields the balance laws and constitutive equations of a nonconducting, charge‐free elastic solid interacting with electromagnetic fields. It is found that the form of the total energy‐momentum tensor and the constitutive equations that follow from a Lagrangian action which depends arbitrarily on the inverse deformation gradients and the electromagnetic field tensor are identical to those obtained by formulating a constitutive theory of a nondissipative material based on the basic mechanical, thermodynamical, and electromagnetic balance laws of a continuum.

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