Question 127: EM waves

Question

A plane electromagnetic wave of frequency
25 GHz is propagating in vacuum along the
z-direction. At a particular point in space and
time, the magnetic field is given by $$\overrightarrow B  = 5 	imes {10^{ - 8}}\widehat jT$$. The corresponding electric field $$\overrightarrow E $$ is (speed of light c = 3 × 10
8
ms
–1
)

Accepted Answer

$$\overrightarrow E  = \overrightarrow B  	imes \overrightarrow V $$
= $$\left( {5 	imes {0^{ - 8}}\widehat j} ight) 	imes \left( {3 	imes {{10}^8}\widehat k} ight)$$
= $${15\,\widehat i}$$ V/m

Answer

15 $$\widehat i$$V / m

Answer

-15 $$\widehat i$$V / m

Answer

1.66 × 10
–16
$$\widehat i$$V / m

Answer

-1.66 × 10
–16
$$\widehat i$$V / m

EM waves

Choose the correct answer: