Electric flux

  • Thread starter yaik
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  • #1
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Why the electric flux [tex]\Phi[/tex] is defined as EAcos[tex]\theta[/tex]?

I don't understand the part about cos[tex]\theta[/tex].....
 

Answers and Replies

  • #3
tiny-tim
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Welcome to PF!

Hi yaik! Welcome to PF! :smile:

Imagine you want to know the flux of bugs flying horizontally along a road.

If you count the number that go splat on your windscreen, then you'll collect less (in a given time) if the windscreen is tilted: the number will be greatest at 90º, and zero at 0º: it'll be proportional to cosθ. :smile:

Mathematically, flux of a field E through a surface with area A is E.(Añ), where ñ is the unit vector normal (perpendicular) to the surface. :wink:
 
  • #4
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thx!!!
 

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