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  1. J

    Energy density

    Homework Statement Two large non-conducting plates of surface area A=.025m^2 carry equal but opposite charges Q = 75microC. What is the energy density of the electric field between the two plates. Homework Equations I wrote the equations on my attempt. This was a multiple choice problem...
  2. J

    Current is equaling zero?

    Homework Statement Homework Equations Kirchhoff's laws and I = V/R The Attempt at a Solution I asked a question recently about a Kirchhoff's law problem and I received a lot of great help and I feel I better understand it. Or so I thought. This is my attempt at the problem. I don't...
  3. J

    Engineering Basic resister circuit with two batteries

    Homework Statement Determine the current in the 7ohm, 8ohm, and 4ohm resister. Homework Equations The series/parallel equations for equivalent resisters. and V=RI. The Attempt at a Solution I'm normally pretty good with these circuit...
  4. J

    Finding flux from cube

    Homework Statement Consider an electric field E = 2x i - 3y j. The coordinate x and y are measured in meters and the electric field is in N/C. What is the magnitude of the flux of this field through a square whose corners are located at (x,y,z) = (0,2,0), (2,2,0), (2,2,2), (0,2,2)? Homework...
  5. J

    Confused about electric potential and electric field

    I get easily confused when asked questions about electric field. One question that is bothering me is... Is it possible to have 0 electric field at a point, but at the same point have electric potential? I've read that the answer is yes, there can be a potential without a electric field, but...