First slide

Nature of electromagnetic wave

Question

A plane electromagnetic wave is given by E= 100 cos (6x $10^{8} t$ + 4x) V/m propagating in a dielectric medium. The refractive index of the medium is

Easy

A

1.5
B

2
C

2.4
D

3

Solution

Velocity of the work is $v = \frac{ω}{k} = \frac{6 \times 10^{8}}{4} = \frac{3}{2} \times 10^{8}$
$μ = \frac{c}{v} = \frac{3 \times 10^{8} \times 2}{3 \times 10^{8}} = 2$

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