The electric field and magnetic field associa | vedclass

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Question

(C) The direction of propagation of an electromagnetic wave is given by the direction of the Poynting vector,which is $\vec S = \vec E 	imes \vec B$.

Vedclass · Accepted Answer

$\vec E = E_0 \hat j, \vec B = B_0 \hat i$

Vedclass · Answer

(C) The direction of propagation of an electromagnetic wave is given by the direction of the Poynting vector,which is $\vec S = \vec E 	imes \vec B$. This implies that the unit vector of propagation $\hat k_{prop} = \hat E 	imes \hat B$. Given that the wave propagates along the $-z$ axis,the direction of propagation is $-\hat k$. Checking the options: For option $C$: $\vec E = E_0 \hat j$ and $\vec B = B_0 \hat i$. Then $\hat E 	imes \hat B = \hat j 	imes \hat i = -\hat k$. This matches the direction of propagation $-\hat k$. Therefore,option $C$ is correct.

The electric field and magnetic field associated with an electromagnetic $(e.m.)$ wave,propagating along the $-z$ axis,can be represented by:

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