1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

X and y componants of electric field

  1. May 9, 2015 #1
    1. The problem statement, all variables and given/known data
    L5KcKX8.jpg

    2. Relevant equations
    Vectors.

    3. The attempt at a solution
    nEMPU3e.jpg

    I understand the magnitude part, and I'm probably being really stupid here but I cant see how he has got the x and y values for the componants (circled in red). If anyone could help it would really be appreciated.
     
  2. jcsd
  3. May 9, 2015 #2

    pasmith

    User Avatar
    Homework Helper

    You have [tex]\vec E = |E|(\cos \theta\,\vec x + \sin \theta\,\vec y)[/tex] for some [itex]\theta[/itex]. Given the horizontal dimensions of the sheet, what are [itex]\cos \theta[/itex] and [itex]\sin \theta[/itex]?

    To calculate [itex]|E|\cos \theta[/itex] and [itex]|E|\sin \theta[/itex] you should use the exact value of [itex]|E|[/itex], not the approximation 223.61 kV/m.
     
  4. May 9, 2015 #3
    Thats very helpful. Thankyou! Although for some reason I get 200 for [itex]|E|\cos \theta[/itex] and 100 for [itex]|E|\sin \theta[/itex]. But I'm happy just to understand the method he used. Thanks!!!
     
  5. May 9, 2015 #4

    pasmith

    User Avatar
    Homework Helper

    You may have interchanged [itex]\vec x[/itex] and [itex]\vec y[/itex]. Note that in the diagram the longer side of the sheet is parallel to the y-axis, which is horizontal across the page.
     
  6. May 9, 2015 #5
    Ahhhh, didnt notice the axis. Thank you!
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: X and y componants of electric field
  1. Solve Y'=x-y (Replies: 6)

  2. X + |x| = y + |y| ? (Replies: 4)

  3. Y + y = sin(x) (Replies: 12)

Loading...