SATHEE: electromagnetic-waves Question 23

electromagnetic-waves Question 23

Question: Q. 15. For a plane electromagnetic wave, propagating along the $z$ -axis, write the two (possible) pairs of expressions for its oscillating electric and magnetic fields. How are the peak values of these (oscillating) fields related to each other?

U] [Foreign 2016]

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Solution:

Ans. For the EM wave, propagating along the $z$ -axis, we have

$E = E_{0} \sin (k z \mp ω t)$ and $B = B_{0} \sin (k z \mp ω t) 1 / 2$

The two possible forms are :

	$E_{x} = E_{0} \sin (k z - ω t)$	$1 / 2$
And	$B_{y} = B_{0} \sin (k z - ω t)$
We have,	$E_{y} = E_{0} \sin (k z + ω t)$	$1 / 2$
	$B_{x} = B_{0} \sin (k z + ω t)$
	$E_{0} = c B_{0}$	$1 / 2$

[Do not deduct any mark if the student uses any of the two signs ( - or + ) in the two sets of expression.]

[CBSE Marking Scheme 2016]

Short Answer Type Questions-II

(3 marks each)

Electromagnetic Waves

electromagnetic-waves Question 23

Short Answer Type Questions-II

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Electromagnetic Waves

electromagnetic-waves Question 23

Short Answer Type Questions-II

Table of Contents

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Test Platform

Sample Mock Test

Mentorship

NCERT Exercise Video Solution

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