Recent content by jezza10181

Hi, I found the following question in a physics book, and so dusted off my 30yr old knowledge on capacitors and tried to answer it. The question is as follows :- "Suppose two nearby conductors carry the same negative charge. Can there be a potential difference between them? If so, can the...

That's a great explanation, thanks. It's finally sunk in lolll

Surely, there would only be -36nC on the right most plate, if you were dealing with the equivalent situation of having a single capacitor of 2.4nF there?

18.0nC on the one 2nF, 18.0nC on the other, & 18.0nc on the 6.0nF? That is 54nC isn't it? I still don't see it, sorry

I have been looking at this question:-Now, I have found the charge in the whole system to be 36.0nC. I did this by 'condensing' the two 2.0nF into a single 4.0nF one, that then leaving me with an equivalent system of a 4.0nF capacitor & a 6.0nF one? I then found the equivalent capacitance of...

Just reminded myself about displacement current, and yes that makes total sense. Its a 'virtual current' that is associated with the magnetic field that is set up within the capacitor as the current starts to build. This displacement current to equal in fact to the current within the circuit, so...

Thanks Dave, I did actually get halfway through a physics degree... many years ago now. I do also have an applied maths degree, so I am no stranger to calculus & differential equations. Its simply that when I was in school I just learned the equations and how to apply them, and I never really...

"If we restrict ourselves to the case you start with an uncharged capacitor -- which I gather you intend to -- the situation right after the circuit is closed is Capacitor uncharged ⇒⇒ 0V over capacitor. 5V over capacitor + resistor ⇒⇒ 5V over resistor and a current 5V/R flows, which charges up...

Hello, I have a question regarding the capacitor/resistor network as shown. My question is simple. I realize that the instant the switch is closed, then the top plate of the capacitor must be at a potential (VA) of 5v. However, I also realize that the instant the switch is closed, literally...

Thanks, the first link was very helpful

Hi, I am dealing with a 'quasi upper triangular matrix', that is mentioned in the book 'Matrix Computations' by Golub & Van Loan. However, neither in the book itself, or anywhere on the internet, am I able to find a formal definition of a 'quasi upper triangular matrix'. I have a rough idea...

Hi, I am aware of the implicit QR algorithm, which utilises the 'Francis QR step' to find the eigenvalues of a real, square matrix. But, how would one find the eigenvalues of a complex matrix? Would the 'explicit' version of the QR algorithm be used here, using complex arithmetic? Thanks