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Question

# Choose the correct answer from the alternatives given. The electric field part of an electromagnetic wave in a medium is represented Ex=0, Ey=2.5NCcos[(2π×106radm)t−(π×10−2rads)x],Ez=0. The wave is

A
moving along x direction with frequency 106Hz and wavelength 100 m
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B
moving along x direction with frequency 106Hz and wavelength 200 m
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C
moving along -x direction with frequency 106 Hz and wavelength 200 m
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D
moving along y direction with frequency 2π×106 Hz and wavelength 200 m
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Solution

## The correct option is B moving along x direction with frequency 106Hz and wavelength 200 mEy=2.5NC×cos[(2π×106radm)t−(π×10−2radsx)]Ez=0,Ex=0The wave is moving in the positive direction of x. This is in the form Ey=E0cos(ωt−kx)ω=2π×1062πυ=2π×106⇒υ=106Hz2πλ=k⇒2πλ=π×10−2orλ=200m

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