Question 113: EM waves

Question

A plane electromagnetic wave of frequency 500 MHz is travelling in vacuum along y-direction. At a particular point in space and time,
$$\overrightarrow B $$ = 8.0 $$	imes$$ 10
$$-$$8
$$\widehat z$$T. The value of electric field at this point is :
(speed of light = 3 $$	imes$$ 10
8
ms
$$-$$1
)
$$\widehat x$$, $$\widehat y$$, $$\widehat z$$ are unit vectors along x, y and z directions.

Accepted Answer

$${E_0} = B.C$$
$${E_0} = (8 	imes {10^{ - 8}}) 	imes (3 	imes {10^8})$$
$$ \Rightarrow {E_0} = 24$$
Direction of wave travelling is in $$\overrightarrow E  	imes \overrightarrow B $$
So, $$( - \widehat x) 	imes \widehat z =  + \widehat y$$
$$ 	herefore $$ $$\widehat E = -24\widehat x$$ V/m

Answer

2.6 $$\widehat x$$ V/m

Answer

$$-$$24 $$\widehat x$$ V/m

Answer

24 $$\widehat x$$ V/m

Answer

$$-$$2.6 $$\widehat y$$ V/m

EM waves

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