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Which option(s) represents/ represent the dielectric loss tangent of a substrate?

  1. Ratio of the real to imaginary parts of the total displacement current
  2. $\left(\omega \epsilon^{\prime \prime}+\sigma\right) /\left(\omega \epsilon^{\prime}\right)$
  3. Ratio of the electric susceptibility to permittivity
  4. Ratio of the polarization vector $\vec{P}$ to the displacement vector $\vec{D}$

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