In an electromagnetic wave,the electric field | vedclass

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Question

(D) The direction of propagation of an electromagnetic wave is given by the direction of the Poynting vector,which is parallel to $\vec{E} 	imes \vec

Vedclass · Accepted Answer

$-\hat{j}$

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(D) The direction of propagation of an electromagnetic wave is given by the direction of the Poynting vector,which is parallel to $\vec{E} 	imes \vec{B}$.Given $\vec{E} = E_{0} \hat{i}$ and $\vec{B} = B_{0} \hat{k}$.The direction of propagation is $\hat{i} 	imes \hat{k}$.Using the cross product rules for unit vectors: $\hat{i} 	imes \hat{j} = \hat{k}$,$\hat{j} 	imes \hat{k} = \hat{i}$,and $\hat{k} 	imes \hat{i} = \hat{j}$.Since the order is reversed,$\hat{i} 	imes \hat{k} = -\hat{j}$.Therefore,the direction of propagation is along $-\hat{j}$.

In an electromagnetic wave,the electric field vector and magnetic field vector are given as $\vec{E} = E_{0} \hat{i}$ and $\vec{B} = B_{0} \hat{k}$ respectively. The direction of propagation of the electromagnetic wave is along:

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