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Electro-magnetic Field Equations

The linear law relating electric stress components to components of elastic strain, electric, and thermal displacements is now
{\bf \sigma_2}~=~ \displaystyle \mathop{\mbox{${\bf c_{21}}$...
 ..._{\mbox{$\sim$}} {{\partial}\over{\partial t}}~{\bf \epsilon_3}\end{displaymath} (22)
Consequently we end up with the following coupled electromagnetic field equations in terms of elastic strains:  
- \displaystyle \mathop{\mbox{${\bf curl}$}}_{\mbox{$\sim$}}...
 ...}}_{\mbox{$\sim$}} ~{\partial \over{\partial t}} {\bf \sigma_2}\end{displaymath} (23)

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