Recent content by GoodEngineering

  1. G

    Why Does Adding a Coil Decrease Current in a Circuit?

    Well I think I forgot to say that it is DC, not AC. This is why I was curious. Of course I know that coils in AC have a resistance, rather inductive reactance.
  2. G

    Why Does Adding a Coil Decrease Current in a Circuit?

    Hello, so today I in my electrical machines class the teacher said that if we add a coil on a cicuit the total current will be less compared with a circuit with no coil included. Also if we replace a coil with (for example) 100 spirals with another with 300 spirals, the total current going...
  3. G

    Undergrad Find the general solution for the differential equation

    So in my previous math class I spotted on my book an exercise that I couldn't solve. We had to find the general solution for the differential equation. This was the exercise: 4y'' - 4y' + y = ex/2√(1-x2) Can anyone tell me how to solve this step by step?
  4. G

    Undergrad What method should I use to get the roots of this equation?

    Yes, actually that was the final part on the test, to get the Yc = c1 + c2ex + the remaining products, but as you may know, I need the roots in order to get the whole solution
  5. G

    Undergrad What method should I use to get the roots of this equation?

    Mentor note: Thread moved to Diff. Equations subforum Hello, few days ago I had a calculus test in which I had to find the general solution for the next differential equation: (D^8 - 2D^4 + D)y = 0. "D" stands for the differential "Dy/Dx". However I could only find 2 of the roots on the...