Question 200: EM waves

Question

An EM wave is propagating in a medium with
a velocity $$\overrightarrow v  = v\widehat i$$. 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

Accepted Answer

As we know,
$$\overrightarrow E  	imes \overrightarrow B  = \overrightarrow V $$
$$ \Rightarrow $$ $$E\widehat j 	imes \overrightarrow B  = v\widehat i$$
[ As given Electric field vector is along +y axis and $$\overrightarrow v  = v\widehat i$$ ]
$$\widehat i = \widehat j 	imes \widehat k$$ so $$\overrightarrow B  = B\widehat k$$.
$$ 	herefore $$ Direction of magnetic field vector is along
+z direction.

Answer

z direction

Answer

+z direction

Answer

–y direction

Answer

–x direction

EM waves

An EM wave is propagating in a medium with a velocity $\overrightarrow v = v\widehat i$. 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

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