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Question

# The electric field part of an electromagnetic wave in a medium is represented by Ex=0, Ey=(2.5NC)cos[(2π×106 rad/s)t−(π×10−2 rad/m)x], Ez=0. The wave is :

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

## The correct option is D Moving along +x direction with frequency 106 Hz and wavelength 200 m.From given data, Ey=(2.5NC)cos[(2π×106 rad/s)t−(π×10−2 rad/m)x] moves along direction +x axis, having wavelength λ=2πk=2ππ×10−2=200 m and Frequency f=ω2π=2π×1062π=106 Hz

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