Recent content by xxbigelxx

Yeah I think I got it now. Thanks.

So would I be correct in following that similar example I posted, but adding a factor of 2 out front?

Oh yes, sorry.

Hmm or would that not work since the 'z' values are different depending on the coil you are talking about at the time.

Oh ok that's what I was wondering. I found this example in the book and thought about closely following it. Would it be the same value, but have a factor of two out front since there are now 2 coils? http://i52.tinypic.com/309sxhi.jpg

Homework Statement We have 2 circular loops, each of radius R with current I in same direction. This is called a Helmholtz coil. The loop axes are along the z axis and the centers are at z=+/-s/2. Find the magnetic field along the z axis between the 2 loops. Homework Equations...

So I would use this equation with a theta value of 90?

I think I made some progress here. I have the E lines going from the top to the bottom. My only question remaining is for part c. Does the midplane mean above the cylinder, or to the side of it? I calculated the distance as if its 100h above the cylinder, along the axis.

Homework Statement An elecret is a dielectric that has a quasi-permanent polarization when there is no applied field. Consider a uniformly polarized cylindrical electret. The cylinder has a radius of 10h and a length h. The polarization is Pk where k is a unit vector along the axis. a. Draw...

Ahh ok I was wondering this. I realized maybe this was the case a few minutes ago, and tried to work it out. Here is what I just did. I think this is correct... Any thoughts are appreciated.

Homework Statement For spherical coordinates, we will need to use Legendre Polynomials, a.Sketch graphs of the first 3 – P0(x), P1(x), and P2(x). b.Evaluate the orthogonality relationship (eq 3.68) to show these 3 functions are orthogonal to each other. (3 integrals). c.Show that the...

Ok great. Thanks.

Homework Statement Please calculate the potential for a sphere that is uniformly charged with density ρ0 and also has a radius of R. a. r<R b. r>R c. Is there a discontinuity of Electric Field at the surface? Explain your reasoning. Homework Equations The Attempt at a...

Ohh ok I think I got it now. If anything else for this question pops up I will ask you. Thanks.

Ohh right that's what I meant. Ok I got it now. Also for the second part of my attachment, how did they know to look for a solution in that form?