Question

The relative permittivity of distilled water is $81$ . The velocity of light in it will be : (Given $\mu_{r}=1$ )

• A. $4.33 \times 10^{7} m / s$
• B. $2.33 \times 10^{7} m / s$
• C. $3.33 \times 10^{7} m / s$
• D. $5.33 \times 10^{7} m / s$

Answer 1

Answer: (C)

$V=\frac{c}{\sqrt{\mu_{r} \varepsilon_{r}}}$
$=3.33 \times 10^{7} m / s$