The relative permittivity of distilled water is 81. The velocity of light in it will be : (Given μr= 1 )
(1) 4.33 x 10⁷ m/s
(2) 2.33 x 10⁷ m/s
(3) 3.33 x 10⁷ m/s
(4) 5.33 x 10⁷ m/s