The relative permittivity of distilled water is 81. The velocity of light in it will be :
Question:

 The relative permittivity of distilled water is 81. The velocity of light in it will be :

(Given $\mu_{\mathrm{r}}=1$ )

  1. $4.33 \times 10^{7} \mathrm{~m} / \mathrm{s}$

  2. $2.33 \times 10^{7} \mathrm{~m} / \mathrm{s}$

  3. $3.33 \times 10^{7} \mathrm{~m} / \mathrm{s}$

  4. $5.33 \times 10^{7} \mathrm{~m} / \mathrm{s}$


Correct Option: , 3

Solution:

$\mathrm{V}=\frac{\mathrm{c}}{\sqrt{\mu_{\mathrm{r}} \varepsilon_{\mathrm{r}}}}$

$=3.33 \times 10^{7} \mathrm{~m} / \mathrm{sec}$

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