Recent content by electricman

Hi, I have some problems to solve this: a=8 , b=5 Let f (x, y)=xye^(− ((x−a)^2)− ((y−b)^ 2)). In which direction, one will go from the point (a, b) in the definition amount if one wants to that the function values will increase so quickly as possible? Decide an equation for tangent...

Hi, I want to confirm this: a=8, b=5, c=7 Count out the distance from origo to planet z = ax + by + c in three different ways. 1) With the aid of linear algebra and geometry (no derivates!). Normalvector is: (a,b,-1) , the length * (8,5,1) = p ,(p=point) p=(x,y,z) gives 8s=x ...

Hi, I want to confirm this: a=8 , b=5 , c=7 Decide the Taylor polynomial of degree 2 in the point (0, a) to the function f (x, y)=sqrt(1+bx+cy). Decide with the aid of Taylor polynomial if the function has a local minimum in (0, a). I used the partial derivates: df/dx =...

Isn´t there anyone who can explain this?

Hi, I am doing an experiment with a coaxial cable and i want to Count out it expected RC-constant for the cable. I have measured the resistance for the cable, but when i count the RC, the resistansen that will be used only is the half of it resistans measured in the beginning. Why...

Hi, I have some problems to solve this: Let f (x, y)=xye^(− ((x−a)^2)− ((y−b)^ 2)). In which direction, one will go from the point (a, b) in the definition amount if one wants to that the function values will increase so quickly as possible? Decide an equation for key planet to the surface...

Excellent, thanks for your help :)

Hmm, well F should be greater, so the answere should be: B A C/D F E, or?

Well, i know that C and D have the same electric potential (because of their position to +q and -q). And B have greater potential than A, and i guess that E have greater than F. I guess this is right because of 1/r. If not maybe someone can explain it for me.

In the figure (se attached) there are two point charges, +q and -q . There are also six positions, labeled A through F, at various distances from the two point charges. Rank the locations A to F on the basis of the electric potential at each point. Rank positive electric potentials as larger...

Homework Statement An infinitely long conducting cylindrical rod with a positive charge "lambda" per unit length is surrounded by a conducting cylindrical shell (which is also infinitely long) with a charge per unit length of "-2 lambda" and radius r1. a) What is E(r) , the radial...

yes, i got the same so i guess that its correct. Thanks for the help

Homework Statement Two particles with positive charges q1 and q2 are separated by a distance s. Along the line connecting the two charges, at what distance from the charge q1 is the total electric field from the two charges zero? Homework Equations Express your answer in terms of...