Answer
305.4k+ views
Hint: When an electromagnetic wave such as light or x-ray or radio wave travels in a medium they all travel in the form of a transverse wave. Now electromagnetic waves are associated with both magnetic and electric fields which move along with them. These field waves are always perpendicular to the direction of motion of the electromagnetic wave.
Complete answer:
Now we know that the electromagnetic waves always propagate in the direction which is perpendicular to the direction of magnetic and electric field associated with them.
So, the options (C) and (D) can be eliminated directly as this option tends to show that the direction of the electromagnetic wave is parallel to the direction of electric and magnetic field.
We need to recall that the cross product of two vectors gives us a new vector whose direction is perpendicular to the direction of the two-vector present.
So according to the Poynting theorem, we cross magnetic field vectors with electric field vectors in order to get the direction of the propagation of the electromagnetic wave.
So, the correct way to get the direction is by crossing the electric field vector with the magnetic field vector.
\[\overrightarrow E \times \overrightarrow B \]
The correct option is (B).
Note:
Now if we \[\overrightarrow E \times \overrightarrow B \] cross we also get the exact value of the speed of the electromagnetic wave. Now we can also see that there is another option which is option (A) in which there is a cross product of vector but here the magnetic field vector is placed first this will give us the direction perpendicular to both the vectors but in the opposite direction to that of the propagation of wave.
Complete answer:
Now we know that the electromagnetic waves always propagate in the direction which is perpendicular to the direction of magnetic and electric field associated with them.
So, the options (C) and (D) can be eliminated directly as this option tends to show that the direction of the electromagnetic wave is parallel to the direction of electric and magnetic field.
We need to recall that the cross product of two vectors gives us a new vector whose direction is perpendicular to the direction of the two-vector present.
So according to the Poynting theorem, we cross magnetic field vectors with electric field vectors in order to get the direction of the propagation of the electromagnetic wave.
So, the correct way to get the direction is by crossing the electric field vector with the magnetic field vector.
\[\overrightarrow E \times \overrightarrow B \]
The correct option is (B).
Note:
Now if we \[\overrightarrow E \times \overrightarrow B \] cross we also get the exact value of the speed of the electromagnetic wave. Now we can also see that there is another option which is option (A) in which there is a cross product of vector but here the magnetic field vector is placed first this will give us the direction perpendicular to both the vectors but in the opposite direction to that of the propagation of wave.
Recently Updated Pages
Mark and label the given geoinformation on the outline class 11 social science CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
When people say No pun intended what does that mea class 8 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Name the states which share their boundary with Indias class 9 social science CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Give an account of the Northern Plains of India class 9 social science CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Change the following sentences into negative and interrogative class 10 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Advantages and disadvantages of science
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Trending doubts
Bimbisara was the founder of dynasty A Nanda B Haryanka class 6 social science CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Which are the Top 10 Largest Countries of the World?
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Differentiate between homogeneous and heterogeneous class 12 chemistry CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
10 examples of evaporation in daily life with explanations
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Give 10 examples for herbs , shrubs , climbers , creepers
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
How do you graph the function fx 4x class 9 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Difference Between Plant Cell and Animal Cell
![arrow-right](/cdn/images/seo-templates/arrow-right.png)