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Homework Help: What is the electric flux through the rectangle

  1. Sep 2, 2004 #1
    Question 1: A 2cm x 3cm rectangle lies in the xz-plane. What is the electric flux through the rectangle if

    E=(50i+100k) N/C


    E=(50i+100j) N/C

    Question 2:
    A 1cm x 1cm x 1cm box is between the plates of a parallel-plate capacitor with two faces of the box perpendicular to E . The electric field strength is 1000 N/C.

    What is the electric flux?

    So far i have gotten .001
    Any suggestions?


    When it comes to the i,j,k stuff I always can never figure it out. Please help!!!
  2. jcsd
  3. Sep 2, 2004 #2
    hello, could u help me with my physics homework?
  4. Sep 3, 2004 #3


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    Science Advisor

    elizabethg: Please don't "hijack" someone else's thread. All homework questions should be posted in the appropriate homework forum- ask specific questions and show what you have done on the problem yourself.

    SpateI600: The rectangle is in the x-z plane so only that part of the field in the y (or j) direction give flux through it.
    In problem 1, E=(50i+100k) N/C which has NO j component- it is parallel to the rectangle and doesn't cross it. What does that tell you about the flux through the rectangle?

    In problem2, E=(50i+100j) N/C. The j component is 100j N/C. Now think about what N and C mean and the area of the rectangle.
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