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The intrinsic impedance of a lossy dielectric medium is given by

1. $\frac{j \omega \mu}{\sigma}$
2. $\frac{j \omega \varepsilon}{\mu}$
3. $\sqrt{\frac{j \omega \mu}{\sigma+j \omega \varepsilon}}$
4. $\sqrt{\frac{\mu}{\varepsilon}}$