Recent content by jimmd

Another example of a convection current is the electron beam in a cathode ray tube. By the way, the typical kind of electric current that you have in an electical wire in which electrons move through the copper conductor is called a conduction current.

The answer is yes, a rotating charged ring does constitute an electrical current in the laboratory (nonrotating) frame -- this kind of electric current is called a convection current --anytime you have bare charges moving relative to the observer (as in this case) there is an electrical current...

I read the entry about the Ehrenfest rotating disk paradox on Wikipedia, but the entry does not actually answer my question about what happens to the circumference of the disk in the "resolution of the paradox" section. All I want to know is what happens to the circumference of the rotating...

Consider an electric circuit at rest in the lab inertial reference frame. The circuit carries a steady electric current I. What is the current in the circuit as observed from a different inertial reference frame with a velocity of v relative to the lab frame? Thanks in advance for your answers