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Homework Help: How do I compute electric flux through a half-cylinder

  1. Jan 30, 2016 #1
    1. The problem statement, all variables and given/known data
    In figure 1, take the half-cylinder's radius and length to be 3.4cm and 15cm respectively.

    If the electric field has magnitude 5.9 kN/C, find the flux through the half-cylinder. Hint: You don't need to do an integral! Why not?

    2. Relevant equations

    3. The attempt at a solution
    I tried finding the area of the cylindrical surface and multiplying that by the magnitude of the electric field. That didn't work. Then I tried finding the area of the rectangle that would be the further side of the half-cylinder and multiplying that by the electric field but again, that didn't work.

    Do I need to use a different equation? I was originally using flux = E * A. Should I be using something else?
  2. jcsd
  3. Jan 30, 2016 #2


    User Avatar

    Staff: Mentor

    Can you show the details of your calculation for the rectangular area method? E*A should work. Are you supposed to specify the result in particular units?
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