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Give answer! - Electromagnetic Waves - NEET

An em wave is propagating in a medium with a velocity \overset{\rightarrow }V = V \hat{i} . The instantaneous oscillating electric field of this em wave is along +y axis. Then the direction of oscillating magnetic field of the em wave will be along

  • Option 1)

    — y direction

  • Option 2)

     + z direction

  • Option 3)

     — z direction

  • Option 4)

    — x direction

 
Answers (1)
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As we have learned

Poynting Vector -

underset{S}{
ightarrow} = frac{underset{E}{
ightarrow} 	imes underset{B}{
ightarrow}}{mu_{o}}

- wherein

It is total energy flowing perpendicularly per second per unit area into the surface in free space.

 

\vec{S}=\bar{E}\times \bar{B}

\vec{S}=V\hat{i}

\vec{E}= E\hat{j}

\hat{i}= \hat{j}\times \hat{k} 

\vec{B}= B \hat{k}, + z- direction

 

 

 


Option 1)

— y direction

This is incorrect

Option 2)

 + z direction

This is correct

Option 3)

 — z direction

This is incorrect

Option 4)

— x direction

This is incorrect

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