Recent content by morangta

Homework Statement I'm looking at an electric field plot around four (4) + and - point charges in free space. There are several points where the electric fields come together and make right-angled turns (in the limit). Is there a name for these points? Especially is there a traditional name for...

What is the potential of Earth with respect to (wrt) infinity (C=710uF)? I am assuming that infinity is the correct reference here. Suppose a capacitor that's normally used in an electric/electronic circuit is a) discharged by connecting its two (2) terminals. b) then they are...

Thank you to Simon for guiding me to a solution to the sheet charge problem I posted. He was most helpful.

Homework Statement Need a free program to plot expressions in polar coordinates. For example, I want to plot the equipotentials for an expression in polar coordinates of the potential for a dipole charge, 4q and -q separated by a distance L. Homework Equations V=kq(4/r1 - 1/r), where r12...

Use Gauss' Law / Diagram of Regions Between & Outside Sheet and Plate Simon, the problem intends for the student to use Gauss' Law. The Gauss pill boxes indicate that the E's are constant in Regions 1 and 4. x= -∞ x=0 x=d x=d+t...

It's not w.r.t. the sheet. I thought about making it w.r.t. Earth, but Earth isn't infinite like the sheet and planar conductor are. How about infinity? Does that make sense? If it doesn't, I hope you educate me on this. Thanks for responding. Regards, Ted

Homework Statement Given an infinite, planar, non-conducting sheet of charge with thickness t. The volume charge density ρ is uniform. A conducting plate, held at a fixed potential V=0V, is placed parallel to the sheet at a distance d. Calculate the electric field E at all points, in all four...

Homework Statement Given that the divergence of a vector C = 0, show that there exists a vector A such that C = curl A. Homework Equations See above. The Attempt at a Solution No clue. Can this be proved with introductory vector calculus? That's all I know, including many of the...

I get it now. Thanks so much for your fast reply. Ted

I am reading an article on the "energy surface" of a Hamiltonian. For a simple harmonic oscillator, I am assuming this "energy surface" has one (1) degree of freedom. For this case, the article states that the "dimensionality of phase space" = 2N = 2 and "dimensionality of the energy surface" =...

What does that have to do with the stationary points?

First-Order Extrema in "Classical Mechanics", Theoretical Minimum In the 3rd lecture of Classical Mechanics, 2011, by Dr. Susskind in his Theoretical Minimum series, he talks about calculating extrema, saddle points, etc. to "first order". "if you move a little bit, the potential is zero, to...

OK, tannerbk. Thank you for the reply.

Treat yourself to a nice schematic diagram, with the fixed-voltage supply in series with a switch and the cap. Since you are assuming a stiff supply, all the charge is lifted through the supply at a constant voltage, so it's [(joules/coulomb)*coulomb] to get energy. Am an EE here, so most all...

Thank you, dextercioby, but I did not understand your explanation. Am working at a very basic level here. Regards, Ted.