An electromagnetic wave propagates through a lossless insulator with a velocity $$1.5 \times 10^{10} \frac{cm}{s}$$ . Calculate the electric and magnetic properties of the insulator if its intrinsic impedance is 90 $$\pi$$ ohms

A

$$\epsilon_{r}=2.26 and \mu_{r}=1.5$$

B

$$\epsilon_{r}=1.5 and \mu_{r}=2.26$$

C

$$\epsilon_{r}=1.2 and \mu_{r}=2.0$$

D

$$\epsilon_{r}=2.0 and \mu_{r}=1.2$$