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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

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As we have learned

Poynting Vector -

$\underset{S}{\rightarrow} = \frac{\underset{E}{\rightarrow} \times \underset{B}{\rightarrow}}{\mu_{o}}$

- 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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