Recent content by justin15501

  1. J

    Energy density

    Well the way it works is my professor goes over this packet of problems (including this one) the day before the exam and leaves us to figure out the questions we got wrong on our own. And there's 165 questions in this packet. It's not a very ideal situation. If I get something wrong, it's not...
  2. J

    Energy density

    The problem doesn't say the distance between the plates.
  3. J

    Energy density

    My answer isn't even one of the multiple choices?
  4. J

    Energy density

    The new answer I get is 508475 instead of 5085. I feel like I may be using a wrong equation or something? My teacher didn't really lecture on energy density at all so I'm a bit uncertain.
  5. 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...
  6. J

    Current is equaling zero?

    Thanks everyone for the help! I learned a lot!
  7. J

    Current is equaling zero?

    So I wrote 3 independent equations for each loop, and the summed up the currents. Would this be correct? You explanation made a tone of sense.
  8. J

    Current is equaling zero?

    What if I wasn't given those two equations? Would I just solve it with the 5 equations I made up?
  9. J

    Current is equaling zero?

    So I didn't get the answer right or I did? Because the 5 equations I used, 2 of them are KCL and 3 are KVL? Assuming I'm wrong, the first thing I would do is write the 2 KCL equations which are: The next step you say is to solve for the node voltages? This is where I start to get confused...
  10. J

    Current is equaling zero?

    I'm very sorry! Yes, the post in #7 makes sense to me.. I added in the top two equations and now I'm getting an answer. How does this look? When I solve the the equation in post #7, i get the I2 that I got in my system of equations. So I guess my answer is right? If it is, I'm still a...
  11. J

    Current is equaling zero?

    If my 5 equations are fine as you said, then shouldn't I1-I5 be correct values? I think my problem is over the confusion of Va1 and Va2. Should I have factored these into my equations? I though Va1 and Va2 was just specified so I can't find the potential difference at those points in part 1...
  12. J

    Current is equaling zero?

    So my equations would be How does the Va1 and Va2 play into the equations? Do they count in as batteries? And I'm confused why the loops I picked won't work?
  13. J

    Current is equaling zero?

    Doesn't the whole big loop around count? Making it 4 loops? And I don't know how to write the KCL equations? Thanks for the reply!
  14. J

    Current is equaling zero?

    I haven't tried calculating them by hand.. Didn't I write the KCL equations as a sum equal to 0? I feel like I have a sign error somewhere..
  15. 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...
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