# Search results

1. ### Fourier Transform

Hi there, I have a range of results from scanning a piece of metal of length L. The results from the scan are %FSH of the oscilloscope. I have to analyse the noise of the signal and thought I'd do this using a fourier transform. Using the range of results as follows could you please tell me...
2. ### Modified Ampere's law

Hi I was wondering if you can help me. How is the concept of the displacement current used to resolve the ploblems with the application of Ampere's law. I know that the modified ampere's law is curl(B)=Mew(0)(jc+jd) I just know how the displacement current jd is used to solve the...
3. ### Deriving Conditions for D field

Hi there, I was wondering if anyone would be willing and able to help me with this question. Q. Derive the boundary condition satisfied by D at the interface between 2 media. I know that the D field is continuous at the suface, but I need to be able to derive this. If anyone can...
4. ### Electric energy of a dielectric sphere

Electric energy of a dielectric sphere!! Hi there, I have attempted a question, I was just seeing if some one can go over it and check if it is ok!! Q. The Electric field E inside a dielectric sphere placed between the plates of a large parallel-plate capacitor is uniform. Given that the...

Total energy of a dielectric sphere please help!!!! I have a problem that I can not do after searching the net and looking through my notes and text book. I think it is a basic electomagnetic field question but i just cant get my head around it. The question is: The electric field E...
6. ### Cold fusion?

Hi I was reading an article in the New Scientist, about how fusion can be created in a device no bigger than a coffee cup. It said that an electrically polarised piece of deuterium doped lithium tantilate (don't know if this is the right spelling) placed in a strong electomagnetic field...
7. ### Difference Between Discovery and Invention

Hi, Heres a little discussion topic that I find interesting. What is the difference between discovery and invention. My own view is that discovery is the coming accross things that are already there and an invention is something which has been created by someone or something that...
8. ### 2d Inellastic collisions

Hi all, I was wondering if someone can help me, its been a while since I did classical mechanics, I have a question I would appreciate a little help from anyone! 2 objects with the same mass m and same velocity v have an inelastic collision . After the collision the 2 object system of...
9. ### Physics and phylosophy?

physics and phylosophy????? I have been having a discusion with someone on the physics forum, admittedly I think I might have annoyed him. I am a physics student, and was wondering, is physics one of the ways of answering phylosophical questions, because this person couldn't quite grasp the...
10. ### Rate of flow and velocity

Hi I hope some one will be able to help me. I have a problem which requires me to find the force exerted on a truck which pumps water from its tank and through a hose at a rate of 10kg/s. The speed that the water exits the hose is 20m/s. This is all the info i am given, Thanks in...