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EMFT - ECE
Plane Waves

Practice questions from Plane Waves.

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Q#1 Plane Waves GATE EC 2023 (Set 1) MCQ +1 mark -0.33 marks

Consider a narrow band signal, propagating in a lossless dielectric medium , with phase velocity  and group velocity . Which of the following statement is true?

( is the velocity of light in vacuum.)

Explanation:
  • Phase velocity,

 

 

  • Group velocity,

 

Here,

 

Hence,

 

Q#2 Plane Waves GATE EC 2023 (Set 1) MSQ +2 marks -0 marks

The electric field of a plane electromagnetic wave is

 

Which of the following combination(s) will give rise to a left handed elliptically polarized (LHEP) wave?

Explanation:

Given,

 

At

 

Going by options,

Option (a):  

at

 at

   

 Hence, it is LHEP.

Option (b):  

at  

at  

 

 Hence, it is LHEP.

Option (c):  

at  

at   

 Hence, it is RHEP.

 

Option (d):  

at  

at

 Hence, it is LHEP.

 Option (a), (b) and (d) are correct.