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Test: Electromagnetic Waves - 1 - Electronics and Communication Engineering (ECE) MCQ


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10 Questions MCQ Test - Test: Electromagnetic Waves - 1

Test: Electromagnetic Waves - 1 for Electronics and Communication Engineering (ECE) 2024 is part of Electronics and Communication Engineering (ECE) preparation. The Test: Electromagnetic Waves - 1 questions and answers have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus.The Test: Electromagnetic Waves - 1 MCQs are made for Electronics and Communication Engineering (ECE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Electromagnetic Waves - 1 below.
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Test: Electromagnetic Waves - 1 - Question 1

Consider the following statements associated with an electromagnetic wave in free space:

  1. At every point in space, the electric field and th emagnetic vector field are perpendicular to each other and to the direction of propagation.
  2. Velocity of propagation of wave in free space is equal to 
  3.  oscillate in phase opposition and the ratio of their amplitude is constant being equal to 
  4. Whatever may be the frequency , the electromagnetic wave travels in space with velocity of light.

Which of the above statements are correct?

Detailed Solution for Test: Electromagnetic Waves - 1 - Question 1
  • Velocity of propagation of EM-wave in free space is equal  = speed of light (3 x 108 m/s). Hence statement-2 is not correct.
  •  oscillate in phase and the ratio of their amplitude is constant being equal to   . Hence, statement-3 is not correct.

Thus, statements-1 and 4 are only correct.

Test: Electromagnetic Waves - 1 - Question 2

Intrinsic impedance or charcteristic impedance of the non-conducting medium in the free space is

Detailed Solution for Test: Electromagnetic Waves - 1 - Question 2

Intrinsic impedance or characteristic impedance of the non-conducting medium in free space is given as

Test: Electromagnetic Waves - 1 - Question 3

If the magnitude of  in a plane wave is 1 V/m, what is the magnitude of H for a plane wave in free space?

Detailed Solution for Test: Electromagnetic Waves - 1 - Question 3

We know that,

Test: Electromagnetic Waves - 1 - Question 4

What is the velocity of a plane wave in a lossless medium having a relative permittivity of 5 and relative permeability of unity?

Detailed Solution for Test: Electromagnetic Waves - 1 - Question 4

Velocity of propagation is given by 

Test: Electromagnetic Waves - 1 - Question 5

A plane wave in free space has an average Poynting vector of 1 Wm-2. The average energy density is

Detailed Solution for Test: Electromagnetic Waves - 1 - Question 5

Poynting vector P= EH and total energy density W= μH2.

Test: Electromagnetic Waves - 1 - Question 6

Infree space   are respectively given by  and  The value of β and H0 are respectively

Detailed Solution for Test: Electromagnetic Waves - 1 - Question 6


This is a plane wave.
For plane wave in space,

Test: Electromagnetic Waves - 1 - Question 7

In a homogeneous non-conducting region where   The value of ∈r and ω are

Detailed Solution for Test: Electromagnetic Waves - 1 - Question 7




Test: Electromagnetic Waves - 1 - Question 8

In free space it is given that,  

Detailed Solution for Test: Electromagnetic Waves - 1 - Question 8

Looking at the phase  we can find that direction of propagation is +z.
Since  must also lie in a + z direction, A must have the direction  

Test: Electromagnetic Waves - 1 - Question 9

Assertion (A): Uniform plane electromagnetic waves are transverse in nature.
Reason (R): Uniform plane electromagnetic
waves have components of only in direction perpendicular to the direction of propagation and not in the direction of propagation.

Test: Electromagnetic Waves - 1 - Question 10

Assertion (A): The term is sometimes referred to the loss tangent.
Reason (R): The two vectors Jc (conduction current density) and Jd (displacement current density) are 180° out of phase and are in the opposite direction in space.

Detailed Solution for Test: Electromagnetic Waves - 1 - Question 10


which indicates that the two vectors Jc and Jd are out of phase in time and are in the same direction in the space. Hence, reason is not a correct statement.

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