The relative permittivity of distilled water is \( 81 \). The velocity of light in it will be: (Given \( \mu_r = 1 \))
\( 3.33 \times 10^{7} \, \text{m} / \text{s} \)
\( 4.33 \times 10^{7} \, \text{m} / \text{s} \)
\( 2.33 \times 10^{7} \, \text{m} / \text{s} \)
\( 5.33 \times 10^{7} \, \text{m} / \text{s} \)
