Recent content by craka

1. Engineering Thevenin equivalent circuit

sorry, thanks for clearing that up matlab.
2. Engineering Thevenin equivalent circuit

The way I understand it, thevenin circuit is the equivalent open circuit voltage and the resistance/impedence seen looking in from the terminals. In this problem to work out your thevenin resistance, you are given the current that flows and the voltage across the terminals when the circuit is...
3. Ac analysis with dependent source

If I convert to the frequency domain and have my voltage as my zero phase reference it shouldn't matter should it? ie voltage 7.071 V @ 0degrees I thought what I tried was mesh loop analysis.
4. Ac analysis with dependent source

Homework Statement Determine I1 independent AC voltage source 10 cos 10^5t inductor 60mH capacitor 5nF dependent voltage controlled voltage source 3Vx Homework Equations KVL & KCL The Attempt at a Solution \begin{array}{l} - 7.071 + 6000I_1 - j6000I_3 = 0 \\...
5. Charge enclosed Guassian surface

No worries. It's just great that you people put your time in a forum such as this. Thanks
6. Calculate the voltage for a diode

ot sure if this helps or hinders. But there is Wien's Law that allows you to determine Peak wavelength for a given temperature in Kevin ie \lambda _{peak} T = 2.90 \times 10^{ - 3} meters.Kelvin The energy gap is the energy required by a semiconductor needed before starting to...
7. Force between to charged plates

Homework Statement Two thin flat plates measure 1m by 1m and are separated by 0.005m. They are oppositely charged with one plate being +15*10^-6 C and the other -15*10^-6 C. Estimate the total forces exerted by one plate on the other Homework Equations F=kq1q2/r^2 \int {\vec E...
8. Charge enclosed Guassian surface

Thanks borgwal, that made it pretty damn easy. Qencl= permitivity of free space * electric flux
9. Charge enclosed Guassian surface

Sorry I do realise the units should be in Coulombs I just in autopilot when I was typing units in sorry. As far as the Areas goes, that what I thought initially aswell. When I calculated the surface area initially I did so for a cube. Thus 6x^2 where x was side dimension of cube. ie the...
10. Charge enclosed Guassian surface

Homework Statement Question states "Total electric flux from a cubical box 0.28m on a side is 1.84x10^3 Nm^2/C. What is the charge enclosed by the box Homework Equations Gauss's Law \begin{array}{l} \phi _E = \vec E \bullet \vec A \\ \oint {\vec E \bullet d\vec A = \frac{{Q_{enclosed}...
11. Cartesian equation of plane that i perpendicular to plane and contains line

Should I than from finding vector <1, -2, 1> do the cross product of it and the direction vector of the line <3,2-1> and than try and find the Cartesian equation of plane ?
12. Cartesian equation of plane that i perpendicular to plane and contains line

By doing the cross product of the direction vectors of r=<5,0,0>+s<2,1,0>+t<-1,0,1> am I not find a vector perpendicular to the plane?
13. Cartesian equation of plane that i perpendicular to plane and contains line

Homework Statement Question states "The plane that contains the line r=<-2,4,3>+t<3,2-1> and is perpendicular to the plane r=<5,0,0>+s<2,1,0>+t<-1,0,1> is:" Answer is y+2z=10 Homework Equations Cross product and dot product of vectors The Attempt at a Solution I found a...
14. Vectors, line contained within plane

Homework Statement It seems to be obvious. But would like to check that for a line to be contained in a plane it needs to be parallel. Correct? Homework Equations The Attempt at a Solution
15. Find Cartesian equation of plane containging line with parametric equations and point

I still haven't been able to do this. I tried to do with cross product of <0,1,2> x <-1,2,1> to get vector normal , which was <-3,-2,1> than did <-3,-2,1> . < x- (-1), y-2, z-1 >=0 which worked out to be -3x-2y+z=0 however this is not the answer still.