Classical Physics | Forum profile

I am writing a few notes on this but a thought came to me. Please humour me once more... It seems that the truth of the 4 laws, rests on their ability to prevent nonsensical situations arising in the world. It also lies in their consistency, meaning that any deductions we make from them must not be self-contradicting. Finally it lies in their completeness at describing the world. We as humans, observe the world and extract from it these basic...

I don't have Matlab codes for this, I do not code in Matlab nor do I develop electrostatic software. You should have more than enough to do this from what I have given you, all of which should be covered in Gibson's book. Gibson gives you a way of solving numerically for a plate of a given voltage. All you need to change is instead of using a rectangular mesh, use a triangular mesh. The self-integral over a triangular mesh of the...

Originally Posted by DaleSpam Please examine the link I posted very carefully: http://farside.ph.utexas.edu/teachin...es/node89.html The derivation is not terribly complicated and the beauty is that once you have understood it you realize that the details of the specific scenario are completely irrelevant. If your analysis violates the conservation of energy then it necessarily also violates Maxwell's equations. The details are not...

Please examine the link I posted very carefully: http://farside.ph.utexas.edu/teachin...es/node89.html The derivation is not terribly complicated and the beauty is that once you have understood it you realize that the details of the specific scenario are completely irrelevant. If your analysis violates the conservation of energy then it necessarily also violates Maxwell's equations. The details are not important and only serve to confuse...

Originally Posted by keith03 . If I want to increase the B of a circular 1"dia 1/8" thick N48 magnet, I would expect to place magnetic steel behind the magnet. I would expect to shield the B on the side I placed the steel, and increase the stregnth of B on the opposite side. How do I know how thick the steel needs to be without being saturated? What kind of increase can I expect?. The first question is easily answered. The...

Originally Posted by Born2bwire Griffiths' introductory electrodynamics text has a section about multipole expansions. Jackson also has a chapter about it but his treatment is much more mathematical and is a general treatment of non-static situations, not as accessible. This is a property of both electric and magnetic fields. Griffiths' treatment is purely with electric fields as they have monopole sources which allows us to do a...

Wow, that seems about right. Thank you very much, diazona, you never disappoint me!

I believe any function of the two angular variables that parametrize a 2D sphere (that is, a spherical surface of the sort which would be embedded in 3D Euclidean space) can be expanded in terms of spherical harmonics. As far as I know, the harmonics are a complete basis.

For any piece of the earth not on the axis of rotation there will be a net centripetal force. Gravity and contact forces (from surrounding material) provide the radial force, the net of which is towards the axis of rotation.

Let's suppose we have a disk which is charged to a constant potential V0, I just want the steps to find the surface charge density of the disk numerically. Only this. If it's possible, could you send to me an essay of matlab's code to perform this? Thanks.