Flux through a square surface

  • Thread starter TheWarHawk
  • Start date
  • #1

Homework Statement



A square surface, 34 mm each side, is immersed with an electric field of magnitude 1700 N/C. The field lines make a 35 degree angle with the normal line. Find the electric flux through the surface.

Homework Equations



[itex]\oint[/itex]E[itex]\cdot[/itex]dA

The Attempt at a Solution



Well, since E[itex]\cdot[/itex]dA can be rewritten as EA*cos([itex]\Theta[/itex]), I did that, and since E and Cos([itex]\Theta[/itex]) are constants, I pulled them out of the integral giving me

E*Cos([itex]\Theta[/itex])[itex]\oint[/itex]dA

which comes out to be E*Cos([itex]\Theta[/itex])*A, but when I plug in 1700*Cos(35)*.0034[itex]^{2}[/itex] it's wrong.

Any suggestions?
 

Answers and Replies

  • #2
vela
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You've converted mm to m incorrectly.
 
  • #3
Sorry, that's a typo on my part, it's supposed to be 3.4 mm
 
  • #4
vela
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Is your calculator in degree mode? Your method is correct.
 
  • #5
Yeah, it is. Must be webassign, I hate it. Thanks very much for your help.
 

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