Tube amplifiers use a control grid that sits in between the anode and cathode. This carries an AC signal received from the guitar. I was wondering how the control grid actually amp …

A few questions about electric field here: Why do charges have to be on the outer surface of the conductor? Why no charge on the inner surface of a hollow conductor? If charges c …

I've found this video on the web: http://www.youtube.com/watch?v=TIhPa...eature=related and id like to be able to build one myself. But i don't really know how to start with this …

The other day I pondered the possibility of harnessing energy from a magnetic field. I was thinking about wind farms and wondered if a similar process could be created with a gener …

The formula for calculating the strength of the electric field bewteen 2 flat bar conductors parallel to each other is E = -dV/dx. What does dx stand for? Is it the separation dist …

Say i have a capacitor and i supply it with a voltage V and after that it has charge density sigmainitial on each plate. Now i remove the voltage source and then introduce a diele …

I have two plates that form a right angle. How would I go about finding the Capacitance of the two plates?

I know that the resistivity for pure carbon = 3.5 x 10^-3Ωm, but i cannot find any useful statistics on the resistivity for graphite.