The velocity of an electromagnetic wave is pa | vedclass

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Question

(B) In an electromagnetic wave,the electric field vector $\vec E$ and the magnetic field vector $\vec B$ oscillate in phase and are perpendicular to e

Vedclass · Accepted Answer

$\vec E 	imes \vec B$

Vedclass · Answer

(B) In an electromagnetic wave,the electric field vector $\vec E$ and the magnetic field vector $\vec B$ oscillate in phase and are perpendicular to each other.According to the properties of electromagnetic waves,the direction of propagation of the wave (which is the direction of the velocity vector $\vec v$) is given by the cross product of the electric field vector and the magnetic field vector.Therefore,the velocity vector $\vec v$ is parallel to $\vec E 	imes \vec B$.This is also related to the Poynting vector $\vec S = \frac{1}{\mu_0} (\vec E 	imes \vec B)$,which represents the directional energy flux (the energy transfer per unit area per unit time) of an electromagnetic field.

The velocity of an electromagnetic wave is parallel to:

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