Recent content by john88

  1. J

    Calculate the current

    Well ye I took away the 2k resistor, and thats not correct but I still end up whit the same answer when I use the current divider, but its not negative. I = 2.72/6500 So now I_tot = I + I1 This must be the right answer
  2. J

    Calculate the current

    ok so if I use the superposition method I get this: First I have this situation http://img387.imageshack.us/my.php?image=firstum9.jpg First I replace the current source whit an open circuit and I end up whit this: http://img66.imageshack.us/my.php?image=second2ud4.jpg So I =...
  3. J

    Calculate the current

    Homework Statement Homework Equations KCL The Attempt at a Solution I have some question for this circuit. http://img510.imageshack.us/my.php?image=questpt3.jpg I want to calculate the current I, my first thought was that it cant go any current because the potential...
  4. J

    Engineering Thevenin equivalent circuit

    ok, got everything together now, ty for the help!
  5. J

    Engineering Thevenin equivalent circuit

    so if short circuit the system. Can I setup KCL on node A and then solve for I, I = I(source) + I(R10). But it seems odd to do so.
  6. J

    Engineering Thevenin equivalent circuit

    Homework Statement Homework Equations The Attempt at a Solution I trying to figure out a thevenin equivalent circuit I want to calculate the current I so I cant get the resistance for the thevenin equivalent. Im not 100% sure how to calculate I, can I use KCL on the node...
  7. J

    Write in form a + bi

    ty!........
  8. J

    Write in form a + bi

    Homework Statement I want to write e^e^i on the form a + bi Homework Equations I think I have to use log The Attempt at a Solution Well ive tried to use log, but theres probably an easy way, but I just cant figure it out. btw does someone know whether you can use latex or...
  9. J

    Complex analysis

    ok I got it! ty...I was alittle confused by the answer.
  10. J

    Complex analysis

    hi I want to find an analytic funktion if Re(z) = 1 - x - 2xy My initial thought was to set U(x,y) = 1 - x - 2xy and then solve for V(x,y) through du/dx = dv/dy but it doesnt seem to go as far as im concernd. Then I thought about the fact that Re(z) = (z + zbar)/2 and then work from...
  11. J

    Parallell plates

    hmm ok..but how do I start whit the calculations then? and isnt it possible to calculate the electric flux D and go from there?
  12. J

    Parallell plates

    Homework Statement I have two parallell plates, they are separated a distance of 1 cm. The potential difference is 10kV. A 0.5 cm thick plastic plate lies between the two plates and has a relative permitivitty of 6. Calcualte E and D in the air and in the plastic plate. Homework Equations...
  13. J

    What is the maximum electric field in the system?

    I posted a picture at the problem...anyway how do I begin to calculate the electric field? Just to use E = V/d doesnt cut it, I need to incorporate the dielectric constants also http://img297.imageshack.us/img297/5145/namnlsvvvvun4.th.jpg [Broken]
  14. J

    What is the maximum electric field in the system?

    Homework Statement Two parallel plates are connected to a constant electrostatic potential. Half the space between the plates is filled whit air, one quarter whit a conductor and the fourth quarter whit a dielectric whit realtive permittivity of 80. What is the maximum electric field in the...
  15. J

    Electric field

    Hi Two spherical shells where the inner has a radius a and the outer a radius of b. The inner has a total charge of -Q whereas the outer shell has a total charge +Q. The question is to calculate the electric field intensity everywhere in space. My question is now, how do I choose the limits...
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