case, the Euler-Bernoulli beam model provides overestimated frequencies. Two-dimensional model allows us to evaluate the electric potential accumulated in the nano-switch due to induced nonuniform strain. Electromechanical nano-switch may be simulated as a dielectric cantilever nanobeam (Fig. 1). The material of the beam may have tetragonal or cubic symmetry or in another words it may be piezo- or nonpiezoelectric. First, let us consider flexoelectric properties of the beam. In [1]-[4] the fourth-order flexoelectric tensor is introduced in two different ways: as µ$_{ijkl}$u$_{j,kl}$ or as f$_{ijkl}$ in the additional term in the thermodynamic potential [4]: Here, S$_{ij}$ , e$_{ijk}$ , η$_{lm}$ , are the components of the strain, dielectric, and relative permittivity tensors, respectively, P$_{i}$ , u$_{i}$ , E$_{m}$ , are the components of polarization, displacement, and electric field vectors, respectively, ε$_{o}$ is the permittivity of vacuum. In [5] there is a structure of the flexoelectric coefficients for a cubic material (in matrix notation): According to [1] and [6], the electric enthalpy may be presented in the form     µ$_{11}$ µ$_{12}$ µ$_{12}$ 0 0 0 µ$_{12}$ µ$_{11}$ µ$_{12}$ 0 0 0 µ$_{12}$ µ$_{12}$ µ$_{11}$ 0 0 0 0 0 0 µ$_{44}$ 0 0 0 0 0 0 µ$_{44}$ 0 0 0 0 0 0 µ$_{44}$    $^{.}$ H ( S$_{ij}$, P$_{i}$, P$_{i,k}$, u$_{i,jk}$ ) = W ( S$_{ij}$, P$_{i}$, P$_{i,k}$, u$_{i,jk}$ ) − 1 2 ε$_{0}$ϕ$_{,i}$ϕ$_{,i}$ + ϕ$_{,i}$P$_{i}$, (3) W ( S$_{ij}$, P$_{i}$, P$_{i,k}$, u$_{i,jk}$ ) = 1 2 a$_{ij}$P$_{i}$P$_{j}$ + 1 2 b$_{ijkl}$P$_{j,i}$P$_{l,k}$ + 1 2 c$_{ijkl}$S$_{ij}$S$_{kl}$ + d$_{ijk}$S$_{jk}$P$_{i}$ + e$_{ijkl}$P$_{j,i}$S$_{kl}$ + f$_{ijkl}$P$_{i}$u$_{j,kl}$ + g$_{ijk}$P$_{i}$P$_{k,j}$, (4) f$_{ijkl}$P$_{i}$u$_{j,kl}$. (2) P$_{l}$ = ε$_{0}$η$_{lm}$E$_{m}$ + e$_{ljk}$S$_{jk}$ + µ$_{ijkl}$u$_{i,jk}$ (1) II. GOVERNING EQUATIONS 3