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Electromagnetic Waves GATE Questions and Answers

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  1.  A plane electromagnetic wave travelling along +z direction, it has its electric field given by

E_x= 2 cos(\omega t)  and

E_y= 2 cos(\omega t+90)

the wave is

a) Linearly polarized

b) Elliptically polarized

c) Left circularly polarized

d) Right circularly polarized

 

2) The electric field of an electromagnetic wave propagating in the positive z direction is

E =i sin( \omega t \beta z) i sin( \omega t \beta z +90) The wave is

 

a) Linearly polarized in the Z direction

b) Elliptically polarized

c) Left Hand circularly polarized

d) Right Hand circularly polarized

 

3) The electric field of a uniform plane electromagnetic wave in free space, along the positive x direction, is given by

E =10(a_y +j a_z) e^{-j25x}

 The frequency and polarization of the wave are

a) 1.2 GHz and left circular
b) 4 GHz and left circular
c) 1.2 GHz and right circular
d) 4 GHz and right circular


4) A plane wave propagating in the dielectric medium has an electric field given as
 Ex  = E0Cos (2.6×1010t -100z). The phase velocity of plane wave is:

a) 10^6 m/s

b) 2.6*10^8 m/s

c) 3*10^8 m/s

d) 2.6*10^{12} m/s

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