Energy Carried by Electromagnetic Waves Video Lessons

Concept

# Problem: At one instant the electric and magnetic fields at one point of an electromagnetic wave are E=(25i + 350j-50k) V/m and B = 0.0254(7.2i-7.0j - 45.4k)μT.A. What is the pointing vector at this time and position? Find the x component? Sx =B. Find the y component.C. Find the z component.

###### FREE Expert Solution

Poynting vector:

$\overline{)\stackrel{\mathbf{⇀}}{\mathbf{S}}{\mathbf{=}}\frac{\mathbf{1}}{{\mathbf{\mu }}_{\mathbf{0}}}{\mathbf{\left(}}\stackrel{\mathbf{⇀}}{\mathbf{E}}{\mathbf{×}}\stackrel{\mathbf{⇀}}{\mathbf{B}}{\mathbf{\right)}}}$

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###### Problem Details

At one instant the electric and magnetic fields at one point of an electromagnetic wave are E=(25i + 350j-50k) V/m and B = 0.0254(7.2i-7.0j - 45.4k)μT.

A. What is the pointing vector at this time and position? Find the x component? Sx =

B. Find the y component.

C. Find the z component.